If，however，theindividualisnotlikelytoobtainamaximumofPleasurebyaimingmerelyatPreservation，itremainstoconsiderwhether``quantityoflife’’willserveanybetter。Nowitisofcoursetruethatsofarasnervousactionisattendedbyconsciousnesspleasurableinquality，themorethereisofit，thehappierweshallbe。
Butevenifweassumethatthemoreintenseandfulllifeis``ontheaverage’’
thehappier，itbynomeansfollowsthatweshallgainmaximumpleasurebyaimingmerelyatintensityofconsciousness:forweexperienceintensepainsevenmoreindubitablythanintensepleasures，andinthose``fulltidesofsoul’’，inwhichweseemtobemostalive，painfulconsciousnessmaybemixedinalmostanyproportion。Andfurtherweoftenexperienceexcitementnearlyorquiteneutralinqualityi。e。notdistinctlypleasurableorpainful，whichreachesagreatpitchofintensity，asinthecaseoflaboriousstruggleswithdifficulties，andperplexingconflictsofwhichtheissueisdoubtful。
Itmay，however，berepliedthat``quantityoflife’’mustbetakentoimplynotmerelyintensityofconsciousness，butmultiplicityandvariety——aharmoniousandmany-sideddevelopmentofhumannature。Andexperiencecertainlyseemstosupporttheviewthatmenlosehappinessbyallowingsomeoftheirfacultiesorcapacitiestobewitheredanddwarfedforwantofexercise，andthusnotleavingthemselvessufficientvarietyoffeelingsoractivities:especiallyasregardsthebodilyorgans，itwillbeagreedthatthedueexerciseofmost，ifnotall，isindispensabletothehealthoftheorganism；andfurther，thatthehealthmaintainedbythisbalanceoffunctionsisamoreimportantsourceoftheindividual’shappinessthantheunhealthyover-exerciseofanyoneorgancanbe。Still，itwouldappearthattheharmonyoffunctionsnecessarytohealthisaveryelasticone，andadmitsofaverywidemarginofvariation，asfarastheorgansundervoluntarycontrolareconcerned。Amane。g。
whoexerciseshisbrainalonewillprobablybeillinconsequence:buthemayexercisehisbrainmuchandhislegslittle，orviceversa，withoutanymorbidresults。And，inthesameway，wecannotlaydowntheproposition，thatavariedandmany-sidedlifeisthehappiest，withasmuchprecisionaswouldbenecessaryifitweretobeacceptedasabasisfordeductiveHedonism。Foritseemstobealsolargelytrue，ontheotherside，thatthemorewecometoexerciseanyfacultywithsustainedandprolongedconcentration，themorepleasurewederivefromsuchexercise，uptothepointatwhichitbecomeswearisome，orturnsintoasemi-mechanicalroutinewhichrendersconsciousnessdullandlanguid。Itis，nodoubt，importantforourhappinessthatweshouldkeepwithinthislimit:butwecannotfixitpreciselyinanyparticularcasewithoutspecialexperience: