However far man may extend himself with his knowledge, however objective he may appear to himself - ultimately he reaps nothing but his own biography.

Be robbers and ravagers as long as you cannot be rulers and owners, you men of knowledge! The time will soon be past when you could be content to live concealed in the woods like timid deer!

Even in the lust of knowledge I feel only my will's delight in begetting and becoming; and if there be innocence in my knowledge it is because my procreative will is in it.

For the purpose of knowledge we must know how to make use of the inward current which draws us towards a thing, and also of the current which after a time draws us away from it.

Close beside my knowledge lies my black ignorance.

Spirit is the life that itself cuts into life: with its own torment it increases its own knowledge. Did you already know that?