Not the height, it is the declivity that is terrible!
The declivity, where the gaze shooteth DOWNWARDS, and the hand graspeth UPWARDS. There doth the heart become giddy through its double will.
Ah, friends, do ye divine also my heart’s double will?
This, this is MY declivity and my danger, that my gaze shooteth towards the summit, and my hand would fain clutch and lean—on the depth!
To man clingeth my will; with chains do I bind myself to man, because I am pulled upwards to the Superman: for thither doth mine other will tend.
And THEREFORE do I live blindly among men, as if I knew them not: that my hand may not entirely lose belief in firmness.
I know not you men: this gloom and consolation is often spread around me.
I sit at the gateway for every rogue, and ask: Who wisheth to deceive me?
This is my first manly prudence, that I allow myself to be deceived, so as not to be on my guard against deceivers.
Ah, if I were on my guard against man, how could man be an anchor to my ball! Too easily would I be pulled upwards and away!
This providence is over my fate, that I have to be without foresight.
And he who would not languish amongst men, must learn to drink out of all glasses; and he who would keep clean amongst men, must know how to wash himself even with dirty water.
And thus spake I often to myself for consolation: “Courage! Cheer up! old heart! An unhappiness hath failed to befall thee: enjoy that as thy—happiness!”
Nietzsche elsewhere
Nietzsche says that Zarathustra, as the first psychologist of the good, is the friend of the evil man, since where the herd animal is virtuous the exceptional man is branded evil; the good and just would call his Superman the devil, and the Superman is the man strong enough to see reality as it is and to be that reality himself.