“To be a machine, to feel, to think, to know how to distinguish good from evil, as well as blue from yellow, in a word, to be born with intelligence and a sure moral instinct, and to be only an animal, are therefore no more contradictory than to be an ape or a parrot and to be able to feel pleasure and pain.”

“The real price of everything, what everything really costs to the man who wants to acquire it, is the toil and trouble of acquiring it.”

“It is not from the benevolence of the butcher, the brewer, or the baker that we expect our dinner, but from their regard to their own interest.”

“The propensity to truck, barter and exchange one thing for another is common to all men, and to be found in no other race of animals.”

“An ounce of action is worth a ton of theory.”