The word 'Christianity' is already a misunderstanding - in reality there has been only one Christian, and he died on the Cross.

If we make sacrifices in doing good or in doing ill, it does not alter the ultimate value of our actions; even if we stake our life in the cause, as martyrs do for the sake of our church : it is a sacrifice to our longing for power, or for the purpose of conserving our sense of power.

Whoever, at any time, has undertaken to build a new heaven has found the strength for it in his own hell.

I still live, I still think: I still have to live, for I still have to think.

A thinker sees his own actions as experiments and questions--as attempts to find out something. Success and failure are for him answers above all.

Tolerance is a proof of distrust in one's own ideals.

To our strongest impulse, to the tyrant in us, not only our reason but also our conscience yields.