Madness is a divine release of the soul from the yoke of custom and convention.

.. we shall not be properly educated ourselves, nor will the guardians whom we are training, until we can recognise the qualities of discipline, courage, generosity, greatness of mind, and others akin to them, as well as their opposites in all their manifestations.

True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.

Human behavior flows from three main sources: desire, emotion, and knowledge.

You need some knowledge to recognize knowledge, so where does the first knowledge come from?

If there is a good and wise God, then there also exists a progress of humanity toward perfection.

There is far greater peril in buying knowledge than in buying meat and drink.