Tragedy is an imitation not of men but of a life, an action

There is nothing strange in the circle being the origin of any and every marvel.

Excellence or virtue is a settled disposition of the mind that determines our choice of actions and emotions and consists essentially in observing the mean relative to us ... a mean between two vices, that which depends on excess and that which depends on defect.

You can never learn anything that you did not already know

The final cause, then, produces motion through being loved.

We deliberate not about ends, but about means.

Opinion involves belief (for without belief in what we opine we cannot have an opinion), and in the brutes though we often find imagination we never find belief.