Beyond Good and Evil by Friedrich Nietzsche Chapter 9 Page 58

‘the subject,’ ready to digress from ‘myself,’ and always without faith in the result, owing to an unconquerable distrust of the POSSIBILITY of self-knowledge, which has led me so far as to feel a CONTRADICTIO IN ADJECTO even in the idea of ‘direct knowledge’ which theorists allow themselves: — this matter of fact is almost the most certain thing I know about myself. There must be a sort of repugnance in me to BELIEVE anything definite about myself. — Is there perhaps some enigma therein?

Probably; but fortunately nothing for my own teeth. — Perhaps it betrays the species to which I belong? — but not to myself, as is sufficiently agreeable to me.”

282. — ”But what has happened to you?” — ”I do not know,”