Towards gnats and fleas we should show no pity. We would do right to hang petty thieves, petty calumniators, and slanderers.

It is I, the ungodly Zarathustra, who says:Who is more ungodly than I, that I may rejoice in his teaching?

What do you believe in?--In this, that the weights of all things must be determined anew.

Probability but no truth, facility but no freedom--it is owing to these two fruits that the tree of knowledge cannot be confused with the tree of life.

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.

Live so that thou mayest desire to live again - that is thy duty - for in any case thou wilt live again!

Does not the discipline of the scientific spirit just commence when one no longer harbours any conviction?