Knowledge of the self is the mother of all knowledge. So it is incumbent on me to know my self, to know it completely, to know its minutiae, its characteristics, its subtleties, and its very atoms.

If you know the enemy and know yourself you need not fear the results of a hundred battles.

Our ambition should be to rule ourselves, the true kingdom for each one of us; and true progress is to know more, and be more, and to do more.

Only the shallow know themselves.

The greatest thing in the world is to know how to belong to oneself.

There’s something which impels us to show our inner souls. The more courageous we are, the more we succeed in explaining what we know.

No one has ever learned fully to know themselves.

Self-knowledge comes from knowing other men.

I do not know myself, and God forbid that I should.

Know thy self, know thy enemy. A thousand battles, a thousand victories.