Time, space, and causality are only metaphors of knowledge, with which we explain things to ourselves.

Preparatory human beings. - I welcome all signs that a more virile, warlike age is about to begin, which will restore honour to courage above all! For this age shall prepare the way for one yet higher, and it shall gather the strength that this higher age will require some day - the age that will carry heroism into the search for knowledge and that will wage wars for the sake of ideas and their consequences.

It is a prejudice to think that morality is more favourable to the development of reason than immorality.

I wish to be at any time hereafter only a yea-sayer!

All that philosophers have handled for millennia has been conceptual mummies; nothing actual has ever escaped from their hands alive.

...one can speak with the utmost clearness, and yet not be heard by anyone.

Mediocrity is the most effective mask a superior spirit can wear, because to the great majority, which is to say, to the mediocre,it will not suggest a disguise:--and yet it is precisely for their sake that he puts it on--so as not to arouse them, and, indeed, not infrequently to avoid this out of pity and benevolence.