No one is free who has not obtained the empire of himself. No man is free who cannot command himself.

Above the cloud with its shadow is the star with its light. Above all things reverence thyself.

The ancient precept, “Know thyself,” and the modern precept, “Study nature,” become at last one maxim.

One has to know the size of one's stomach.

Know thyself? If I knew myself I would run away.

Self-awareness is not self-centeredness, and spirituality is not narcissism. 'Know thyself' is not a narcissistic pursuit.