We should behave to our friends as we would wish our friends to behave to us.

Nature makes nothing incomplete, and nothing in vain.

That man is more of a political animal than bees or any other gregarious animals is evident. Nature, as we often say, makes nothing in vain, and man is the only animal who has the gift of speech.

We . . . make war that we may live in peace. Nicomachean Ethics bk. 10, 1177b

A tragedy, then, is the imitation of an action that is serious and also, as having magnitude, complete in itself; in language with pleasurable accessories, each kind brought in separately in the parts of the work; in a dramatic, not in a narrative form; with incidents arousing pity and fear, wherewith to accomplish its catharsis of such emotions.

The whole is not, as it were, a mere heap, but the totality is something besides the parts.

Knowing what is right does not make sagacious man.

Virtue is more clearly shown in the performance of fine actions than in the nonperformance of base ones.

A common danger unites even the bitterest enemies.

It would be wrong to put friendship before the truth.