"Zarathustra was the first to see in the struggle between good and evil the essential cycle in the working of things. The translation of morality into the realm of metaphysics, as force, cause, as end in itself, is his work. But the very question presents its own answer. Zarathustra created this most fateful of all errors—morality; therefore he must be the first to recognize it."
January 1, 1970
https://en.wikiquote.org/wiki/Zoroaster