“One pound invested for five years gives the same result as five pounds invested for one year, the product being five pound years.” GivingYearsResultsFiveProductsFive YearsPounds Book:The Theory of Political Economy Source: The Theory of Political Economy
“What capital I give for the spade merely replaces what the manufacturer had already invested in the expectation that the spade would be needed.” GivingWould BeNeededExpectationsSpades Book:The Theory of Political Economy Source: The Theory of Political Economy
“When quite young I can remember I had no thought or wish of surpassing others. I was rather taken with a liking of little arts and bits of learning. My mother carefully fostered a liking for botany, giving me a small microscope and many books, which I yet have. Strange as it may seem, I now believe that botany and the natural system, by exercising discrimination of kinds, is the best of logical exercises. What I may do in logic is perhaps derived from that early attention to botany.” GivingBelieveKindMayLittlesArtI CanBookSeemsRememberYoungMotherWishBitsNaturalAttentionTakenStrangeExerciseLogicDiscriminationLogicalMicroscopesSurpassingBotany Author:William Stanley Jevons
“I am convinced that it is impossible to expound the methods of induction in a sound manner, without resting them upon the theory of probability. Perfect knowledge alone can give certainty, and in nature perfect knowledge would be infinite knowledge, which is clearly beyond our capacities. We have, therefore, to content ourselves with partial knowledge - knowledge mingled with ignorance, producing doubt.” GivingWould BeScienceSoundAbilityPerfectKnowledgeDoubtImpossibleIgnoranceTheoryCapacityInfiniteMethodConvincedCertaintyProbabilityInfinite Knowledge Author:William Stanley Jevons
