It is not enough for me that lightning no longer does any harm. I do not wish to conduct it away: it shall learn to work for me. My wisdom has long gathered like a cloud; it is becoming stiller and darker. Thus does every wisdom that is yet to give birth to lightning bolts. For these men of today I do not wish to be light, or to be called light. These I wish to blind. Lightning of my wisdom! put out their eyes!
Thus Spoke Zarathustra , Part IV
Walter Kaufmann translation from evankozierachi.com