Suppose,again,thathehasacquiredmoreexperience,andhaslivedsolongintheworldastohaveobservedfamiliarobjectsoreventstobeconstantlyconjoinedtogether;whatistheconsequenceofthisexperience?Heimmediatelyinferstheexistenceofoneobjectfromtheappearanceoftheother。Yethehasnot,byallhisexperience,acquiredanyideaorknowledgeofthesecretpowerbywhichtheoneobjectproducestheother;norisitbyanyprocessofreasoning,heisengagedtodrawthisinference。Butstillhefindshimselfdeterminedtodrawit:
Andthoughheshouldbeconvincedthathisunderstandinghasnopartintheoperation,hewouldneverthelesscontinueinthesamecourseofthinking。Thereissomeotherprinciplewhichdetermineshimtoformsuchaconclusion。
ThisprincipleisC/USTOM\\orH/ABIT\\。Forwherevertherepetitionofanyparticularactoroperationproducesapropensitytorenewthesameactoroperation,withoutbeingimpelledbyanyreasoningorprocessoftheunderstanding,wealwayssay,thatthispropensityistheeffectof
Perhapswecanpushourenquiriesnofarther,orpretendtogivethecauseofthiscause;butmustrestcontentedwithitastheultimateprinciple,whichwecanassign,ofallourconclusionsfromexperience。Itissufficientsatisfaction,thatwecangosofar,withoutrepiningatthenarrownessofourfacultiesbecausetheywillcarryusnofarther。Anditiscertainwehereadvanceaveryintelligiblepropositionatleast,ifnotatrueone,whenweassertthat,aftertheconstantconjunctionoftwoobjects——heatandflame,forinstance,weightandsolidity——wearedeterminedbycustomalonetoexpecttheonefromtheappearanceoftheother。Thishypothesisseemseventheonlyonewhichexplainsthedifficulty,whywedraw,fromathousandinstances,aninferencewhichwearenotabletodrawfromoneinstance,thatis,innorespect,differentfromthem。Reasonisincapableofanysuchvariation。Theconclusionswhichitdrawsfromconsideringonecirclearethesamewhichitwouldformuponsurveyingallthecirclesintheuniverse。Butnoman,havingseenonlyonebodymoveafterbeingimpelledbyanother,couldinferthateveryotherbodywillmoveafteralikeimpulse。
Allinferencesfromexperience,therefore,areeffectsofcustom,notofreasoning。[12]
Custom,then,isthegreatguideofhumanlife。Itisthatprinciplealonewhichrendersourexperienceusefultous,andmakesusexpect,forthefuture,asimilartrainofeventswiththosewhichhaveappearedinthepast。Withouttheinfluenceofcustom,weshouldbeentirelyignorantofeverymatteroffactbeyondwhatisimmediatelypresenttothememoryandsenses。Weshouldneverknowhowtoadjustmeanstoends,ortoemployournaturalpowersintheproductionofanyeffect。Therewouldbeanendatonceofallaction,aswellasofthechiefpartofspeculation。
Buthereitmaybepropertoremark,thatthoughourconclusionsfromexperiencecarryusbeyondourmemoryandsenses,andassureusofmattersoffactwhichhappenedinthemostdistantplacesandmostremoteages,yetsomefactmustalwaysbepresenttothesensesormemory,fromwhichwemayfirstproceedindrawingtheseconclusions。Aman,whoshouldfindinadesertcountrytheremainsofpompousbuildings,wouldconcludethatthecountryhad,inancienttimes,beencultivatedbycivilizedinhabitants;butdidnothingofthisnatureoccurtohim,hecouldneverformsuchaninference。Welearntheeventsofformeragesfromhistory;butthenwemustperusethevolumesinwhichthisinstructioniscontained,andthencecarryupourinferencesfromonetestimonytoanother,tillwearriveattheeyewitnessesandspectatorsofthesedistantevents。Inaword,ifweproceednotuponsomefact,presenttothememoryorsenses,ourreasoningswouldbemerelyhypothetical;andhowevertheparticularlinksmightbeconnectedwitheachother,thewholechainofinferenceswouldhavenothingtosupportit,norcouldweever,byitsmeans,arriveattheknowledgeofanyrealexistence。IfI
askwhyyoubelieveanyparticularmatteroffact,whichyourelate,youmusttellmesomereason;andthisreasonwillbesomeotherfact,connectedwithit。Butasyoucannotproceedafterthismanner,
What,then,istheconclusionofthewholematter?A
simpleone;though,itmustbeconfessed,prettyremotefromthecommontheoriesofphilosophy。Allbeliefofmatteroffactorrealexistenceisderivedmerelyfromsomeobject,presenttothememoryorsenses,andacustomaryconjunctionbetweenthatandsomeotherobject。Orinotherwords;
havingfound,inmanyinstances,thatanytwokindsofobjects——flameandheat,snowandcold——havealwaysbeenconjoinedtogether;ifflameorsnowbepresentedanewtothesenses,themindiscarriedbycustomtoexpectheatorcold,andto
Atthispoint,itwouldbeveryallowableforustostopourphilosophicalresearches。Inmost
questionswecannevermakeasinglestepfarther;andinallquestionswemustterminatehereatlast,afterourmostrestlessandcuriousenquiries。Butstillourcuriositywillbepardonable,perhapscommendable,ifitcarryusontostillfartherresearches,andmakeusexaminemoreaccuratelythenatureofthis
PARTII。
N/OTHING\\ismorefreethantheimaginationofman;andthoughitcannotexceedthatoriginalstockofideasfurnishedbytheinternalandexternalsenses,ithasunlimitedpowerofmixing,compounding,separating,anddividingtheseideas,inallthevarietiesoffictionandvision。Itcanfeignatrainofevents,withalltheappearanceofreality,ascribetothemaparticulartimeandplace,conceivethemasexistent,andpaintthemouttoitselfwitheverycircumstance,thatbelongstoanyhistoricalfact,whichitbelieveswiththegreatestcertainty。Wherein,therefore,consiststhedifferencebetweensucha
Itfollows,therefore,thatthedifferencebetween
Itmustbeexcitedbynature,likeallothersentiments;andmustarisefromtheparticularsituation,inwhichthemindisplacedatanyparticularjuncture。Wheneveranyobjectispresentedtothememoryorsenses,itimmediately,bytheforceofcustom,carriestheimaginationtoconceivethatobject,whichisusuallyconjoinedtoit;andthisconceptionisattendedwithafeelingorsentiment,differentfromtheloosereveriesofthefancy。Inthisconsiststhewholenatureofbelief。Forasthereisnomatteroffactwhichwebelievesofirmlythatwecannotconceivethecontrary,therewouldbenodifferencebetweentheconceptionassentedtoandthatwhichisrejected,wereitnotforsomesentimentwhichdistinguishestheonefromtheother。IfIseeabilliard-ballmovingtowardanother,onasmoothtable,Icaneasilyconceiveittostopuponcontact。Thisconceptionimpliesnocontradiction;butstillitfeelsverydifferentlyfromthatconceptionbywhichI
representtomyselftheimpulseandthecommunicationofmotionfromoneballtoanother。
Werewetoattempta
onthepassionsandimagination。Providedweagreeaboutthething,itisneedlesstodisputeabouttheterms。Theimaginationhasthecommandoverallitsideas,andcanjoinandmixandvarythem,inallthewayspossible。Itmayconceivefictitiousobjectswithallthecircumstancesofplaceandtime。Itmaysetthem,inamanner,beforeoureyes,intheirtruecolours,justastheymighthaveexisted。Butasitisimpossiblethatthisfacultyofimaginationcanever,ofitself,reachbelief,itisevidentthatbeliefconsistsnotinthepeculiarnatureororderofideas,butinthe
thanassert,that
Theseideastakefasterholdofmymindthanideasofanenchantedcastle。Theyareverydifferenttothefeeling,andhaveamuchgreaterinfluenceofeverykind,eithertogivepleasureorpain,joyorsorrow。
Letus,then,takeinthewholecompassofthisdoctrine,andallow,thatthesentimentofbeliefisnothingbutaconceptionmoreintenseandsteadythanwhatattendsthemerefictionsoftheimagination,andthatthis
ofconceptionarisesfromacustomaryconjunctionoftheobjectwithsomethingpresenttothememoryorsenses:I
believethatitwillnotbedifficult,uponthesesuppositions,tofindotheroperationsofthemindanalogoustoit,andtotraceupthesephenomenatoprinciplesstillmoregeneral。
Wehavealreadyobservedthatnaturehasestablishedconnexionsamongparticularideas,andthatnosooneroneideaoccurstoourthoughtsthanitintroducesitscorrelative,andcarriesourattentiontowardsit,byagentleandinsensiblemovement。Theseprinciplesofconnexionorassociationwehavereducedtothree,namely,
Andifthecasebethesamewiththeotherrelationsorprinciplesofassociations,thismaybeestablishedasagenerallaw,whichtakesplaceinalltheoperationsofthemind。
Wemay,therefore,observe,asthefirstexperimenttoourpresentpurpose,that,upontheappearanceofthepictureofanabsentfriend,ourideaofhimisevidentlyenlivenedbythe
TheceremoniesoftheR/OMAN\\C/ATHOLIC\\religionmaybeconsideredasinstancesofthesamenature。Thedevoteesofthatsuperstitionusuallypleadinexcuseforthemummeries,withwhichtheyareupbraided,thattheyfeelthegoodeffectofthoseexternalmotions,andpostures,andactions,inenliveningtheirdevotionandquickeningtheirfervour,whichotherwisewoulddecay,ifdirectedentirelytodistantandimmaterialobjects。Weshadowouttheobjectsofourfaith,saythey,insensibletypesandimages,andrenderthemmorepresenttousbytheimmediatepresenceofthesetypes,thanitispossibleforustodomerelybyanintellectualviewandcontemplation。Sensibleobjectshavealwaysagreaterinfluenceonthefancythananyother;andthisinfluencetheyreadilyconveytothoseideastowhichtheyarerelated,andwhichtheyresemble。Ishallonlyinferfromthesepractices,andthisreasoning,thattheeffectofresemblanceinenliveningtheideasisverycommon;andasineverycasearesemblanceandapresentimpressionmustconcur,weareabundantlysuppliedwithexperimentstoprovetherealityoftheforegoingprinciple。
Wemayaddforcetotheseexperimentsbyothersofadifferentkind,inconsideringtheeffectsof
aswellasof
butitisonlytheactualpresenceofanobject,thattransportsitwithasuperiorvivacity。WhenIamafewmilesfromhome,whateverrelatestoittouchesmemorenearlythanwhenIamtwohundredleaguesdistant;thoughevenatthatdistancethereflectingonanythingintheneighbourhoodofmyfriendsorfamilynaturallyproducesanideaofthem。Butasinthislattercase,boththeobjectsofthemindareideas;notwithstandingthereisaneasytransitionbetweenthem;thattransitionaloneisnotabletogiveasuperiorvivacitytoanyoftheideas,forwantofsomeimmediateimpression。[13]
Noonecandoubtbutcausationhasthesameinfluenceastheothertworelationsofresemblanceandcontiguity。
Superstitiouspeoplearefondofthereliquesofsaintsandholymen,forthesamereason,that
theyseekaftertypesorimages,inordertoenliventheirdevotion,andgivethemamoreintimateandstrongconceptionofthoseexemplarylives,whichtheydesiretoimitate。Nowitisevident,thatoneofthebestreliques,whichadevoteecouldprocure,wouldbethehandyworkofasaint;andifhiscloathsandfurnitureareevertobeconsideredinthislight,itisbecausetheywereonceathisdisposal,andweremovedandaffectedbyhim;inwhichrespecttheyaretobeconsideredasimperfecteffects,andasconnectedwithhimbyashorterchainofconsequencesthananyofthose,bywhichwelearntherealityofhisexistence。
Suppose,thatthesonofafriend,whohadbeenlongdeadorabsent,werepresentedtous;itisevident,thatthisobjectwouldinstantlyreviveitscorrelativeidea,andrecalltoourthoughtsallpastintimaciesandfamiliarities,inmorelivelycoloursthantheywouldotherwisehaveappearedtous。Thisisanotherphaenomenon,whichseemstoprovetheprincipleabovementioned。
Wemayobserve,that,inthesephaenomena,thebeliefofthecorrelativeobjectisalwayspresupposed;withoutwhichtherelationcouldhavenoeffect。Theinfluenceofthepicturesupposes,thatwe
assert,thatthisbelief,whereitreachesbeyondthememoryorsenses,isofasimilarnature,andarisesfromsimilarcauses,withthetransitionofthoughtandvivacityofconceptionhereexplained。WhenIthrowapieceofdrywoodintoafire,mymindisimmediatelycarriedtoconceive,thatitaugments,notextinguishestheflame。Thistransitionofthoughtfromthecausetotheeffectproceedsnotfromreason。Itderivesitsoriginaltogetherfromcustomandexperience。Andasitfirstbeginsfromanobject,presenttothesenses,itrenderstheideaorconceptionofflamemore
strongandlivelythananyloose,floatingreverieoftheimagination。Thatideaarisesimmediately。Thethoughtmovesinstantlytowardsit,andconveystoitallthatforceofconception,whichisderivedfromtheimpressionpresenttothesenses。Whenaswordislevelledatmybreast,doesnottheideaofwoundandpainstrikememorestrongly,thanwhenaglassofwineispresentedtome,eventhoughbyaccidentthisideashouldoccuraftertheappearanceofthelatterobject?Butwhatisthereinthiswholemattertocausesuchastrongconception,exceptonlyapresentobjectandacustomarytransitionoftheideaofanotherobject,whichwehavebeenaccustomedtoconjoinwiththeformer?Thisisthewholeoperationofthemind,inallourconclusionsconcerningmatteroffactandexistence;anditisasatisfactiontofindsome
analogies,bywhichitmaybeexplained。Thetransitionfromapresentobjectdoesinallcasesgivestrengthandsoliditytotherelatedidea。
Here,then,isakindofpre-establishedharmonybetweenthecourseofnatureandthesuccessionofourideas;andthoughthepowersandforces,bywhichtheformerisgoverned,bewhollyunknowntous;yetourthoughtsandconceptionshavestill,wefind,goneoninthesametrainwiththeotherworksofnature。Customisthatprinciple,bywhichthiscorrespondencehasbeeneffected;sonecessarytothesubsistenceofourspecies,andtheregulationofourconduct,ineverycircumstanceandoccurrenceofhumanlife。
Hadnotthepresenceofanobject,instantlyexcitedtheideaofthoseobjects,commonlyconjoinedwithit,allourknowledgemusthavebeenlimitedtothenarrowsphereofourmemoryandsenses;andweshouldneverhavebeenabletoadjustmeanstoends,oremployournaturalpowers,eithertotheproducingofgood,oravoidingofevil。Those,whodelightinthediscoveryandcontemplationof
Ishalladd,forafurtherconfirmationoftheforegoingtheory,that,asthisoperationofthemind,bywhichweinferlikeeffectsfromlikecauses,and
themind,bysomeinstinctormechanicaltendency,whichmaybeinfallibleinitsoperations,maydiscoveritselfatthefirstappearanceoflifeandthought,andmaybeindependentofallthelaboureddeductionsoftheunderstanding。Asnaturehastaughtustheuseofourlimbs,withoutgivingustheknowledgeofthemusclesandnerves,bywhichtheyareactuated;sohassheimplantedinusaninstinct,whichcarriesforwardthethoughtinacorrespondentcoursetothatwhichshehasestablishedamongexternalobjects;thoughweareignorantofthosepowersandforces,onwhichthisregularcourseandsuccessionofobjectstotallydepends。
SECTIONVI。
OfProbability。[14]
Thereiscertainlyaprobability,whicharisesfromasuperiorityofchancesonanyside;andaccordingasthissuperiorityincreases,andsurpassestheoppositechances,theprobabilityreceivesaproportionableincrease,andbegetsstillahigherdegreeofbelieforassenttothatside,inwhichwediscoverthesuperiority。Ifadyeweremarkedwithonefigureornumberofspotsonfoursides,andwithanotherfigureornumberofspotsonthetworemainingsides,itwouldbemoreprobable,thattheformerwouldturnupthanthelatter;though,ifithadathousandsidesmarkedinthesamemanner,andonlyonesidedifferent,theprobabilitywouldbemuchhigher,andourbelieforexpectationoftheeventmoresteadyandsecure。Thisprocessofthethoughtorreasoningmayseemtrivialandobvious;buttothosewhoconsideritmorenarrowly,itmay,perhaps,affordmatterforcuriousspeculation。
Itseemsevident,that,whenthemindlooksforwardtodiscovertheevent,whichmayresultfromthethrowofsuchadye,itconsiderstheturningupofeachparticularsideasalikeprobable;andthisistheverynatureofchance,torenderalltheparticularevents,comprehendedinit,entirelyequal。Butfindingagreaternumberofsidesconcurintheoneeventthanintheother,themindiscarriedmorefrequentlytothatevent,andmeetsitoftener,inrevolvingthevariouspossibilitiesorchances,onwhichtheultimateresultdepends。Thisconcurrenceofseveralviewsinoneparticulareventbegetsimmediately,byaninexplicablecontrivanceofnature,thesentimentofbelief,andgivesthateventtheadvantageoveritsantagonist,whichissupportedbyasmallernumberofviews,andrecurslessfrequentlytothemind。Ifweallow,thatbeliefisnothingbutafirmerandstrongerconceptionofanobjectthanwhatattendsthemerefictionsoftheimagination,thisoperationmay,perhaps,insomemeasure,beaccountedfor。Theconcurrenceoftheseseveralviewsorglimpses
imprintstheideamorestronglyontheimagination;givesitsuperiorforceandvigour;rendersitsinfluenceonthepassionsandaffectionsmoresensible;andinaword,begetsthatrelianceorsecurity,whichconstitutesthenatureofbeliefandopinion。
Thecaseisthesamewiththeprobabilityofcauses,aswiththatofchance。Therearesomecauses,whichareentirelyuniformandconstantinproducingaparticulareffect;andnoinstancehaseveryetbeenfoundofanyfailureorirregularityintheiroperation。Firehasalwaysburned,andwatersuffocatedeveryhumancreature:Theproductionofmotionbyimpulseandgravityisanuniversallaw,whichhashithertoadmittedofnoexception。Butthereareothercauses,whichhavebeenfoundmoreirregularanduncertain;norhasrhubarbalwaysprovedapurge,oropiumasoporifictoeveryone,whohastakenthesemedicines。Itistrue,whenanycausefailsofproducingitsusualeffect,philosophersascribenotthistoanyirregularityinnature;
butsuppose,thatsomesecretcauses,intheparticularstructureofparts,havepreventedtheoperation。Ourreasonings,however,andconclusionsconcerningtheeventarethesameasifthisprinciplehadnoplace。Beingdeterminedbycustomtotransferthepasttothefuture,inallourinferences;wherethepasthasbeenentirelyregularanduniform,weexpecttheeventwiththegreatestassurance,andleavenoroomforanycontrarysupposition。
Butwheredifferenteffectshavebeenfoundtofollowfromcauses,whichareto
Herethenitseemsevident,that,whenwetransferthepasttothefuture,inordertodeterminetheeffect,whichwillresultfromanycause,wetransferallthedifferentevents,inthesameproportionastheyhaveappearedinthepast,andconceiveonetohaveexistedahundredtimes,forinstance,anothertentimes,andanotheronce。Asagreatnumberofviewsdohereconcurinoneevent,theyfortifyandconfirmittotheimagination,begetthatsentimentwhichwecall
SECTIONVII。
OftheIdeaofNecessaryConnexion。
PARTI。
T/HE\\greatadvantageofthemathematicalsciencesabovethemoralconsistsinthis,thattheideasoftheformer,beingsensible,arealwaysclearanddeterminate,thesmallestdistinctionbetweenthemisimmediatelyperceptible,andthesametermsarestillexpressiveofthesameideas,withoutambiguityorvariation。Anovalisnevermistakenforacircle,noranhyperbolaforanellipsis。Theisoscelesandscalenumaredistinguishedbyboundariesmoreexactthanviceandvirtue,rightandwrong。Ifanytermbedefinedingeometry,themindreadily,ofitself,substitutes,onalloccasions,thedefinitionforthetermdefined:Orevenwhennodefinitionisemployed,theobjectitselfmaybepresentedtothesenses,andbythatmeansbesteadilyandclearlyapprehended。Butthefinersentimentsofthemind,theoperationsoftheunderstanding,thevariousagitationsofthepassions,thoughreallyinthemselvesdistinct,easilyescapeus,whensurveyedbyreflection;norisitinourpowertorecalltheoriginalobject,asoftenaswehaveoccasiontocontemplateit。
Ambiguity,bythismeans,isgraduallyintroducedintoourreasonings:Similarobjectsarereadilytakentobethesame:Andtheconclusionbecomesatlastverywideofthepremises。
Onemaysafely,however,affirm,that,ifweconsiderthesesciencesinaproperlight,theiradvantagesanddisadvantagesnearlycompensateeachother,andreducebothofthemtoastateofequality。Ifthemind,withgreaterfacility,retainstheideasofgeometryclearanddeterminate,itmustcarryonamuchlongerandmoreintricatechainofreasoning,andcompareideasmuchwiderofeachother,inordertoreachtheabstrusertruthsofthatscience。Andifmoralideasareapt,withoutextremecare,tofallintoobscurityandconfusion,theinferencesarealwaysmuchshorterinthesedisquisitions,andtheintermediatesteps,whichleadtotheconclusion,muchfewerthaninthescienceswhichtreatofquantityandnumber。Inreality,thereisscarcelyapropositioninE/UCLID\\sosimple,asnottoconsistofmoreparts,thanaretobefoundinanymoralreasoningwhichrunsnotintochimeraandconceit。Wherewetracetheprinciplesofthehuman
mindthroughafewsteps,wemaybeverywellsatisfiedwithourprogress;consideringhowsoonnaturethrowsabartoallourenquiriesconcerningcauses,andreducesustoanacknowledgmentofourignorance。Thechiefobstacle,therefore,toourimprovementinthemoralormetaphysicalsciencesistheobscurityoftheideas,andambiguityoftheterms。Theprincipaldifficultyinthemathematicsisthelengthofinferencesandcompassofthought,requisitetotheformingofanyconclusion。And,perhaps,ourprogressinnaturalphilosophyischieflyretardedbythewantofproperexperimentsandphaenomena,whichareoftendiscoveredbychance,andcannotalwaysbefound,whenrequisite,evenbythemostdiligentandprudentenquiry。Asmoralphilosophyseemshithertotohavereceivedlessimprovementthaneithergeometryorphysics,wemayconclude,that,iftherebeanydifferenceinthisrespectamongthesesciences,thedifficulties,whichobstructtheprogressoftheformer,requiresuperiorcareandcapacitytobesurmounted。
Therearenoideas,whichoccurinmetaphysics,moreobscureanduncertain,thanthoseof
Weshall,therefore,endeavour,inthissection,tofix,ifpossible,theprecisemeaningoftheseterms,andtherebyremovesomepartofthatobscurity,whichissomuchcomplainedofinthisspeciesofphilosophy。
Itseemsaproposition,whichwillnotadmitofmuchdispute,thatallourideasarenothingbutcopiesofourimpressions,or,inotherwords,thatitisimpossibleforusto
inventioncanwethrowlightupontheseideas,andrenderthemaltogetherpreciseanddeterminatetoourintellectualview?Producetheimpressionsororiginalsentiments,fromwhichtheideasarecopied。Theseimpressionsareallstrongandsensible。Theyadmitnotofambiguity。Theyarenotonlyplacedinafulllightthemselves,butmaythrowlightontheircorrespondentideas,whichlieinobscurity。Andbythismeans,wemay,perhaps,attainanewmicroscopeorspeciesofoptics,bywhich,inthemoralsciences,themostminute,andmostsimpleideasmaybesoenlargedastofallreadilyunderourapprehension,andbeequallyknownwiththegrossestandmostsensibleideas,thatcanbetheobjectofourenquiry。
Tobefullyacquainted,therefore,withtheideaofpowerornecessaryconnexion,letusexamineitsimpression;
andinordertofindtheimpressionwithgreatercertainty,letussearchforitinallthesources,fromwhichitmaypossiblybederived。
Whenwelookaboutustowardsexternalobjects,andconsidertheoperationofcauses,weareneverable,inasingleinstance,todiscoveranypowerornecessaryconnexion;anyquality,whichbindstheeffecttothecause,andrenderstheoneaninfallibleconsequenceoftheother。
Weonlyfind,thattheonedoesactually,infact,followtheother。Theimpulseofonebilliard-ballisattendedwithmotioninthesecond。Thisisthewholethatappearstothe
Consequently,thereisnot,inanysingle,particularinstanceofcauseandeffect,anythingwhichcansuggesttheideaofpowerornecessaryconnexion。
Fromthefirstappearanceofanobject,wenevercanconjecturewhateffectwillresultfromit。Butwerethepowerorenergyofanycausediscoverablebythemind,wecouldforeseetheeffect,evenwithoutexperience;andmight,atfirst,pronouncewithcertaintyconcerningit,bymeredintofthoughtandreasoning。
Inreality,thereisnopartofmatter,thatdoesever,byitssensiblequalities,discoveranypowerorenergy,orgiveusgroundtoimagine,thatitcouldproduceanything,orbefollowedbyanyotherobject,whichwecoulddenominateitseffect。Solidity,extension,motion;thesequalitiesareallcompleteinthemselves,andneverpointoutanyothereventwhichmayresultfromthem。Thescenesoftheuniversearecontinuallyshifting,andoneobjectfollowsanotherinanuninterruptedsuccession;butthepowerofforce,whichactuatesthewholemachine,isentirelyconcealedfromus,andneverdiscoversitselfinanyofthesensiblequalitiesofbody。Weknowthat,infact,heatisaconstantattendantofflame;butwhatistheconnexionbetweenthem,wehavenoroomsomuchastoconjectureorimagine。Itisimpossible,therefore,thattheideaofpowercanbederivedfromthecontemplationofbodies,insingleinstancesoftheiroperation;becausenobodieseverdiscoveranypower,whichcanbetheoriginalofthisidea。[16]
Since,therefore,externalobjectsastheyappeartothesenses,giveusnoideaofpowerornecessaryconnexion,bytheiroperationinparticularinstances,letussee,whetherthisideabederivedfromreflectionontheoperationsofourownminds,andbecopiedfromanyinternalimpression。Itmaybesaid,thatweareeverymomentconsciousofinternalpower;whilewefeel,that,bythesimplecommandofourwill,wecanmovetheorgansofourbody,ordirectthefacultiesofourmind。Anactofvolitionproducesmotioninourlimbs,orraisesanewideainourimagination。Thisinfluenceofthewillweknowbyconsciousness。Henceweacquiretheideaofpowerorenergy;
andarecertain,thatweourselvesandallotherintelligentbeingsarepossessedofpower。Thisidea,then,isanideaofreflection,sinceitarisesfromreflectingontheoperationsofourownmind,andonthecommandwhichisexercisedbywill,bothovertheorgansofthebodyandfacultiesofthesoul。
Weshallproceedtoexaminethispretension;andfirstwithregardtotheinfluenceofvolitionovertheorgansofthebody。Thisinfluence,wemayobserve,isafact,which,likeallothernaturalevents,canbeknownonlybyexperience,andcanneverbeforeseenfromanyapparentenergyorpowerinthecause,whichconnectsitwiththeeffect,andrenderstheoneaninfallibleconsequenceoftheother。Themotionofourbodyfollowsuponthecommandofourwill。Ofthisweareeverymomentconscious。Butthemeans,bywhichthisiseffected;theenergy,bywhichthewillperformssoextraordinaryanoperation;ofthiswearesofarfrombeingimmediatelyconscious,thatitmustforeverescapeourmostdiligent
enquiry。
For
Thisquestionwouldneverembarrassus,wereweconsciousofapowerintheformercase,notinthelatter。Weshouldthenperceive,independentofexperience,whytheauthorityofwillovertheorgansofthebodyiscircumscribedwithinsuchparticularlimits。Beinginthatcasefullyacquaintedwiththepowerorforce,bywhichitoperates,weshouldalsoknow,whyitsinfluencereachespreciselytosuchboundaries,andnofarther。
Aman,suddenlystruckwithpalsyinthelegorarm,orwhohadnewlylostthosemembers,frequentlyendeavours,atfirsttomovethem,andemploythem,intheirusualoffices。
Hereheisasmuchconsciousofpowertocommandsuchlimbs,asamaninperfecthealthisconsciousofpowertoactuateanymemberwhichremainsinitsnaturalstateandcondition。
Butconsciousnessneverdeceives。Consequently,neitherintheonecasenorintheother,areweeverconsciousofanypower。Welearntheinfluenceofourwillfromexperiencealone。Andexperienceonlyteachesus,howoneeventconstantlyfollowsanother;withoutinstructingusinthesecretconnexion,whichbindsthemtogether,andrenderstheminseparable。
Butiftheoriginalpowerwerefelt,itmustbeknown:Wereitknown,itseffectalsomustbeknown;sinceallpowerisrelativetoitseffect。And
Wemay,therefore,concludefromthewhole,Ihope,withoutanytemerity,thoughwithassurance;thatourideaofpowerisnotcopiedfromanysentimentorconsciousnessofpowerwithinourselves,whenwegiverisetoanimalmotion,orapplyourlimbstotheirproperuseandoffice。
Thattheirmotionfollowsthecommandofthewillisamatterofcommonexperience,likeothernaturalevents:Butthepowerorenergybywhichthisiseffected,likethatinothernaturalevents,isunknownandinconceivable。[17]
Shallwethenassert,thatweareconsciousofapowerorenergyinourownminds,when,byanactorcommandofourwill,weraiseupanewidea,fixthemindtothecontemplationofit,turnitonallsides,andatlastdismissitforsomeotheridea,whenwethinkthatwehavesurveyeditwithsufficientaccuracy?Ibelievethesameargumentswillprove,thateventhiscommandofthewillgivesusnorealideaofforceorenergy。