The Jew is an inborn Communist.

Everything evil is revenge.

Logic and ethics are fundamentally the same, they are no more than duty to oneself

There are transitional forms between the metals and non-metals; between chemical combinations and simple mixtures, between animals and plants, between phanerogams and cryptogams, and between mammals and birds [...]. The improbability may henceforth be taken for granted of finding in Nature a sharp cleavage between all that is masculine on the one side and all that is feminine on the other; or that any living being is so simple in this respect that it can be put wholly on one side, or wholly on the other, of the line.

But the higher a man mounts, the greater may be his fall; all genius is a conquering of chaos, mystery.

The genius which runs to madness is no longer genius.

I regret that I must so continually use the word genius, as if that should apply only to a caste as well defined from those below as income-tax payers are from the untaxed. The word genius was very probably invented by a man who had small claims on it himself; greater men would have understood better what to be a genius really was, and probably they would have come to see that the word could be applied to most people. Goethe said that perhaps only a genius is able to understand a genius.