“The poorest man in the world is the one who has to buy his happiness.”

“There are treasures in books that all the money in the world cannot buy, but the poorest laborer can have for nothing.”

“There is no such thing as a perfectly happy or perfectly unhappy man in the world. One has more happiness in his life and another more unhappiness, and the same circumstance may produce widely different effects on individuals of different temperaments.”

“Anyone who thinks money can't buy happiness has never owned a cat [or any pet].”

“God has entrusted me with myself. No man is free who is not master of himself. A man should so live that his happiness shall depend as little as possible on external things. The world turns aside to let any man pass who knows where he is going.”

“Human beings consider themselves satisfied only compared to some other condition. A man who has owned nothing but a bicycle all of his life feels suddenly wealthy the moment he buys an automobile...But this happy sensation wears off. After a while the car becomes just another thing that he owns. Moreover, when his neighbor next door buys two cars, in an instant our man feels wretchedly poor and deprived.”