The man of genius possesses, like everything else, the complete female in himself; but woman herself is only a part of the Universe, and the part can never be the whole; femaleness can never include genius. This lack of genius on the part of woman is inevitable because woman is not a monad, and cannot reflect the Universe.

There are probably very few people who have not at some time of their lives had some quality of genius. If they have not had such, it is probable that they have also been without great sorrow or great pain. They would have needed only to live sufficiently intently for a time for some quality to reveal itself. The poems of first love are a case in point, and certainly such love is a sufficient stimulus.

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.

No men who really think deeply about women retain a high opinion of them; men either despise women or they have never thought seriously about them.

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.

Everything evil is revenge.

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