Knowing yourself is the beginning of all wisdom.

For imagining lies within our power whenever we wish . . . but in forming opinons we are not free . . .

If the consequences are the same it is always better to assume the more limited antecedent, since in things of nature the limited, as being better, is sure to be found, wherever possible, rather than the unlimited.

Metaphysics is universal and is exclusively concerned with primary substance. ... And here we will have the science to study that which is, both in its essence and in the properties which it has.

Nature does nothing in vain. Therefore, it is imperative for persons to act in accordance with their nature and develop their latent talents, in order to be content and complete.

Therefore, the good of man must be the end of the science of politics.

Sophocles said he drew men as they ought to be, and Euripides as they were.