The finest and healthiest thing about science is, as in the mountains, the brisk air blowing around in it.--The spiritually delicate (such as artists) shun and slander science owing to this air.
Unconsciously we seek the principles and opinions which are suited to our temperament, so that at last it seems as if these principles and opinions had formed our character and given it support and stability.
But the worst enemy you can meet will always be yourself; you lie in wait for yourself in caverns and forests. Lonely one, you are going the way to yourself! And your way goes past yourself, and past your seven devils! You will be a heretic to yourself and witch and soothsayer and fool and doubter and unholy one and villain. You must be ready to burn yourself in your own flame: how could you become new, if you had not first become ashes?
When an idea is just rising on the horizon, the soul's temperature with respect to it is usually very cold. Only gradually does the idea develop its warmth, and it is hottest (which is to say, exerting its greatest influence) when belief in the idea is already once again in decline.
I have learned to walk: since then I have run. I have learned to fly: since then I do not have to be pushed in order to move. Now I am nimble, now I fly, now I see myself under myself, now a god dances within me.