Conjugal love, or the friendship of spouses, can persist even after sexual desires have weakened, withered, and disappeared.

Friendship is a very taxing and arduous form of leisure activity.

The ultimate end of education is happiness or a good human life, a life enriched by the possession of every kind of good, by the enjoyment of every type of satisfaction.

The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as we continue to live.

Love consists in giving without getting in return in giving what is not owed, what is not due the other. That's why true love is never based, as associations for utility or pleasure are, on a fair exchange.