The wisdom of men is worth little or nothing.

It was Plato, according to Sosigenes, who set this as a problem for those concerned with these things, through what suppositions of uniform and ordered movements the appearances concerning the movements of the wandering heavenly bodies could be preserved.

You ought not to heal the body without the soul, for this is the great error of our day in treating the human body.

Nothing in human affairs is worth any great anxiety.

Love is a grave mental illness.

There's a victory and defeat-the first and best of victories, the lowest and worst of defeats-which each man gains or sustains at the hands not of another, but of himself.

Knowledge is true opinion.