To be the equal of one's opponent-this is the first condition of an honourable duel.

The magnitude of a progress is gauged by the greatness of the sacrifice that it requires.

The strong individual loves the earth so much he lusts for recurrence. He can smile in the face of the most terrible thought: meaningless, aimless existence recurring eternally. The second characteristic of such a man is that he has the strength to recognize - and to live with the recognition - that the world is valueless in itself and that all values are human ones. He creates himself by fashioning his own values; he has the pride to live by the values he wills.

When I contemplated purpose I also contemplated chance and foolishness.

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.

God is Dead; but given the way of men, there may still be caves for thousands of years in which his shadow will be shown. And we - we still have to vanquish his shadow, too.

Faith, indeed, has up to the present not been able to move real mountains, although I do not know who assumed that it could. But it can put mountains where there are none.