Love is a grave mental illness.

Virtue is voluntary, vice involuntary.

Of all the things of a man's soul which he has within him, justice is the greatest good and injustice the greatest evil.

Entire ignorance is not so terrible or extreme an evil, and is far from being the greatest of all.

Let us affirm what seems to be the truth, that, whether one is or is not, one and the others in relation to themselves and one another, all of them, in every way, are and are not, and appear to be and appear not to be.

Either we shall find what it is we are seeking or at least we shall free ourselves from the persuasion that we know what we do not know.

All soul is immortal. For that which is always in movement is immortal; that which moves something else, and is moved by something else, in ceasing from movement ceases from living. So only that which moves itself, because it does not abandon itself, never stops moving. But it is also source and first principle of movement for the other things which move.