Jealous is every virtue of the others, and a dreadful thing is jealousy. Even virtues may succumb by jealousy.

He whom the flame of jealousy encompasseth, turneth at last, like the scorpion, the poisoned sting against himself.

Ah, my brother, hast thou never seen a virtue backbite and stab itself?

Man is something that hath to be surpassed; and therefore shalt thou love thy virtues — for thou wilt succumb by them.

Thus spake Zarathustra.