One is fruitful only at the cost of being rich in contradictions.

Man must become better and more evil.

But this word will I say to my enemies: What is all manslaughter in comparison with what you have done to me!

Those who show pity and are always ready to help during times of trouble are seldom the same ones who rejoice in our joy: when others are happy they have nothing to do, they become superfluous and lose their feeling of superiority, and so they easily show their displeasure.

And if your friend does evil to you, say to him, ''I forgive you for what you did to me, but how can I forgive you for what you did to yourself?

Yet tell me, my brothers: if a goal for humanity is still lacking, is there not still lacking--humanity itself?

Every attainment, every step forward in knowledge, follows from courage, from hardness against oneself, from cleanliness in relation to oneself.