All literature, all philosophical treatises, all the voices of antiquity are full of examples for imitation, which would all lie unseen in darkness without the light of literature.

What society does to its children, so will its children do to society.

Philosophy is true mother of the arts [of science].

To give and receive advice - the former with freedom, and yet without bitterness, the latter with patience and without irritation - is peculiarly appropriate to geniune friendship.

Friendship was given by nature to be an assistant to virtue, not a companion in vice.

It is a crime to put a Roman citizen in chains, it is an enormity to flog one, sheer murder to slay one: what, then, shall I say of crucifixion? It is impossible to find the word for such an abomination.

Since an intelligence common to us all makes things known to us and formulates them in our minds, honorable actions are ascribed by us to virtue, and dishonorable actions to vice; and only a madman would conclude that these judgments are matters of opinion, and not fixed by nature.