Am I not destroying my enemies when I make them my friends?

I desire so to conduct the affairs of this administration that if at the end . . . I have lost every other friend on earth, I shall at least have one friend left, and that friend shall be down inside of me.

I teach you, the superman. Man is something to be surpassed

The doer alone learneth.

Whenever I climb I am followed by a dog called 'Ego'.

Believe me! The secret of reaping the greatest fruitfulness and the greatest enjoyment from life is to live dangerously!

Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.

Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

You will never have a greater or lesser dominion than that over yourself. . . . the height of a man's success is gauged by his self-mastery; the depth of his failure by his self-abandonment. . . . And this law is the expression of eternal justice. He who cannot establish dominion over himself will have no dominion over others.