Happiness depends upon ourselves.

When people are friends, they have no need of justice, but when they are just, they do need friendship in addition; and in the realm of the just things, the most just seems to be what involves friendship.

I have gained this from philosophy: that I do without being commanded what others do only from fear of the law.

Hence anyone who is to listen intelligently to lectures about what is noble and just and, generally, about the subjects of political science must have been brought up in good habits.

The least deviation from truth will be multiplied later.

With regard to excellence it is not enough to know but we must try to have and use it.

To attain any assured knowledge about the soul is one of the most difficult things in the world.