Knowledge of the soul is the only universal truth and the only wisdom - all other knowledge is transient.

If the head and the body are to be well, you must begin by curing the soul.

If a man be endowed with a generous mind, this is the best kind of nobility.

To escape from evil we must be made as far as possible like God; and the resemblance consists in becoming just and holy and wise.

If there is no contradictory impression, there is nothing to awaken reflection

We will be better men, braver and less idle, if we believe that one must search for the things one does not know, rather than if we believe that it is not possible to find out what we do not know and that we must not look for it.

We are too feeble and sluggish to make our way out to the upper limit of the air. If someone could reach the summit, or put on wings and fly aloft, when he put up his head he would see the world above, just as fishes see our world when they put up their heads out of the sea; and if his nature were able to bear the sight, he would recognize that that is the true heaven.