"The bonds of society are formed by the common needs of men, and the common good of all is the end of society."

"It is not good for man to be alone; and I say it is not good for him to be a philosopher."

"It is by the passion of love that the sexes are drawn together, and by the passion of love that they are distinguished."

"To be loved is to be useful, to be useful is to be loved."

"The habit of reading is the only enjoyment in which there is no alloy; it lasts when all other pleasures fade."