The student of politics therefore as well as the psychologist must study the nature of the soul.

The investigation of the truth is in one way hard, in another easy. An indication of this is found in the fact that no one is able to attain the truth adequately, while, on the other hand, no one fails entirely, but everyone says something true about the nature of all things, and while individually they contribute little or nothing to the truth, by the union of all a considerable amount is amassed.

If then nature makes nothing without some end in view, nothing to no purpose, it must be that nature has made all of them for the sake of man.

Plato is my friend, but truth is a better friend.

Virtue is more clearly shown in the performance of fine ACTIONS than in the non-performance of base ones.

The vices respectively fall short of or exceed what is right in both passions and actions, while virtue both finds and chooses that which is intermediate.

Of actions some aim at what is necessary and useful, and some at what is honorable. And the preference given to one or the other class of actions must necessarily be like the preference given to one or other part of the soul and its actions over the other; there must be war for the sake of peace, business for the sake of leisure, things useful and necessary for the sake of things honorable.