You are treading the path to your greatness: no one shall follow you here! Your passage has effaced the path behind you, and above that path stands written: Impossibility.
What I must do is all that concerns me, not what people think. This rule,equally arduous in actual and intellectual life, may serve for the whole distinction between greatness and meanness. It is the harder, because you will always find those who think they know what is your duty better than you know it. It is easy in the world to live after the world's opinion; it is easy in solitude to live after our own; but the great man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude.
Animal experimentation is the blackest of all the black crimes that a man is at present committing... We should be able to refuse to live if the price of living be the torture of sentient beings... I abhor [animal] experimentation with my whole soul. All the scientific discoveries stained with innocent blood I count as of no consequence... The greatness of a nation and its moral progress can be judged by the way its animals are treated.
But how to explain suffering because of a man? It's not explainable. With that kind of suffering, a person feels as if they're in hell, because there is no nobility, no greatness - only misery.
At most, the greatest persons are but great wens, and excrescences; men of wit and delightful conversation, but as morals for ornament, except they be so incorporated into the body of the world that they contribute something to the sustentation of the whole.
My formula for greatness in a human being is amor fati: that one wants nothing to be different, not forward, not backward, not in all eternity. Not merely bear what is necessary, still less conceal it—all idealism is mendaciousness in the face of what is necessary—but love it
Pretension may sit still, but cannot act. Pretension never feigned an act of real greatness. Pretension never wrote an Iliad, nordrove back Xerxes, nor christianized the world, nor abolished slavery.
And inasmuch as the great-souled man deserves most, he must be the best of men; for the better a man is the more he deserves, and he that is best deserves most. Therefore the truly great-souled man must be a good man. Indeed greatness in each of the virtues would seem to go with greatness of soul.