Nietzsche

Not only must the thought emerge out of the creative moment of decision in some given individual, but as a thought that pertains to life itself it must also be a historical decision -- a crisis. p.154 continued p. 155 This plan culminates in a fifth point entitled "The doctrine of eternal return as hammer in the hand of the most powerful man. Wherever the thought of thoughts is indeed thought, that is to say, is incorporated, it conducts the thinker to supreme decisions in such a way that he expands beyond himself, thus attaining power over himself and willing himself. In this way such a man is as will to power.