Among athletes there is a thing known as over-training: if it is persisted in it wrecks the body. A similar phenomenon is to be found among thinkers: thought too severe and protracted may ruin the mind. Was this the explanation of Nietzsche's downfall? Certainly, his intellectual health was that of the athlete who remains vigorous by virtue of a never-sleeping discipline, who maintains his balance by a continuous effort. This is perhaps the highest, the most exquisite form of health, but it is at the same time the most dangerous--a little more, a little less, and the engine of thought is destroyed. It is important that the thinker should discover exactly how far he may discipline himself, and how far permit indulgence. What in the ordinary man--conscious of no _secondary raison d'être_--is performed without fuss by the instincts, must by him be _thought out_--a task of great peril. 78 _A Dilemma_ To be a man is easy: to be a purpose is more difficult; but, on the whole--easy. In the first instance, one has but to exist; in the second, to act. But to unite man and purpose in the same person--to be a type--is both difficult and precarious. For that a balance is imperative: "being" and "doing" must be prevented from injuring each other: action must become rhythm, and rest, a form of energy. To be in doing, to do in being--that is the task of the future man. The danger of our being mere man is that mankind may remain forever stationary, without a goal. The danger of our being mere purpose is that our humanity may altogether drop out and nothing but the purpose be left. And would not that defeat the purpose? 79 _Dangers of Genius_ Why is it that so many men of genius have been destroyed by falling into chasms of desire which are safely trodden by common men? Is it because there is within the exceptional man greater compass, and, therefore, greater danger? The genius has left the animal further behind than the ordinary man; indeed, in the genius of the nobler sort there is an almost passionate avoidance and disavowal of the animal. In this disavowal lie at once his safety and his danger: by means of it he climbs to perilous heights, and is also secure upon them. But let him abrogate even once this denial of kinship, and he is in the utmost danger. He now finds himself stationed on the edge of a precipice up to which he seems to have climbed in a dream, a dreadful dizziness assails him, along with a mad desire to fling himself into the depths. It was perhaps a leap of this kind that Marlowe made, and Shelley. Meantime, the ordinary man lives in safety at the foot of the precipice: he is never so far above the animal as to be injured by a fall into animalism. Only to the noble does spiritual _danger_ come. 80 _A Strange Failure_