The one exclusive sign of thorough knowledge is the power of teaching.

A vivid image compels the whole body to follow.

So virtue is a purposive disposition, lying in a mean that is relative to us and determined by a rational principle, and by that which a prudent man would use to determine it. It is a mean between two kinds of vice, one of excess and the other of deficiency.

For well-being and health, again, the homestead should be airy in summer, and sunny in winter. A homestead possessing these qualities would be longer than it is deep; and its main front would face the south.

Of the tyrant, spies and informers are the principal instruments. War is his favorite occupation, for the sake of engrossing the attention of the people, and making himself necessary to them as their leader.

Where perception is, there also are pain and pleasure, and where these are, there, of necessity, is desire.

Knowledge of the fact differs from knowledge of the reason for the fact.