Aristotle

The female is, as it were, a mutilated male.

Slavery is natural and beneficial to the master and the slave.

The earth is at the center of the universe.

Heavy bodies naturally fall, and light bodies naturally rise.

The soul is the first actuality of a natural body that has life potentially.

For as the eyes of bats are to the blaze of day, so is the reason in our soul to the things which are by nature most evident of all.

Plants exist for the sake of animals, and brute beasts for the sake of man.

The function of man is an activity of soul which follows or implies a rational principle.

The investigation of the truth is in one way hard, in another easy.

If one way be better than another, that you may be sure is nature's way.

The ideal man bears the accidents of life with dignity and grace, making the best of circumstances.

The life of theoretical philosophy is the best and happiest a man can lead.

The wise man does not expose himself needlessly to danger, since there are few things for which he cares sufficiently; but he is willing, in great crises, to give even his life—knowing that under certain conditions it is not worthwhile to live.

The young are permanently in a state resembling intoxication.

The state comes into existence for the sake of life and continues to exist for the sake of the good life.

The gods too are fond of a joke.

The beginning of reform is not so much to equalize property as to train the noble sort of natures not to desire more, and to prevent the lower from getting more.

The virtue of a thing is relative to its proper work.

The probable impossible is always preferable to the improbable possible.

The form of the animal, its essence, is its soul.