All teaching and all intellectual learning come about from already existing knowledge.

To die in order to avoid the pains of poverty, love, or anything that is disagreeable, is not the part of a brave man, but of a coward.

[Prudence] is the virtue of that part of the intellect [the calculative] to which it belongs; and . . . our choice of actions will not be right without Prudence any more than without Moral Virtue, since, while Moral Virtue enables us to achieve the end, Prudence makes us adopt the right means to the end.

The virtue of the good man is necessarily the same as the virtue of the citizen of the perfect state.

A line is not made up of points. ... In the same way, time is not made up parts considered as indivisible 'nows.' Part of Aristotle's reply to Zeno's paradox concerning continuity.

Dignity does not consist in possessing honors, but in deserving them.

Selfishness doesn't consist in a love to yourself, but in a big degree of such love.