“Insanity is hereditary. You get it from your children.”

“Don't watch the clock; do what it does. Keep going.”

“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.”