. . . the man is free, we say, who exists for his own sake and not for another's.

The antidote for fifty enemies is one friend.

A man becomes a friend whenever being loved he loves in return.

There are three things that are the motives of choice and three that are the motives of avoidance; namely, the noble, the expedient, and the pleasant, and their opposites, the base, the harmful, and the painful. Now in respect of all these the good man is likely to go right and the bad to go wrong, but especially in respect of pleasure; for pleasure is common to man with the lower animals, and also it is a concomitant of all the objects of choice, since both the noble and the expedient appear to us pleasant.

There is simple ignorance, which is the source of lighter offenses, and double ignorance, which is accompanied by a conceit of wisdom.

We work to earn our leisure.

He who has conferred a benefit on anyone from motives of love or honor will feel pain, if he sees that the benefit is received without gratitude.