The soul suffers when the body is diseased or traumatized, while the body suffers when the soul is ailing.

If, therefore, there is any one superior in virtue and in the power of performing the best actions, him we ought to follow and obey, but he must have the capacity for action as well as virtue.

It is easy to perform a good action, but not easy to acquire a settled habit of performing such actions.

[Meanness] is more ingrained in man's nature than Prodigality; the mass of mankind are avaricious rather than open-handed.

Virtue makes us aim at the right end, and practical wisdom makes us take the right means.

A person's life persuades better than his word.

Now, the causes being four, it is the business of the student of nature to know about them all, and if he refers his problems back to all of them, he will assign the "why" in the way proper to his science-the matter, the form, the mover, that for the sake of which.