Nietzsche summed up by the narrator in this documentary:
Everything is necessary. Therefore, everything is innocent.
Every sort of idealism which is discontented with reality as it is, is exposed as a damaging illusion that makes us hate ourselves and hate life.
Instead, Nietzsche offers what he calls “the innocence of becoming”. When we really know ourselves and our desires, then it’s innocent and right that we should choose our own values on the basis of our own desires. We consciously and innocently accept life’s own self affirmation and make it our own. And the very fact that this new life affirming egoistic ethic is itself only another rationalisation, makes it playful, irresponsible.
He calls it amor fati, the love of necessity. We accept the world as it is without regrets and without any false moralism.
Let’s repeat with Wikipedia’s words:
Amor fati is a Latin phrase that may be loosely translated as “love of fate” or “love of one’s fate”. It is used to describe an attitude in which one sees everything that happens in one’s life, including suffering and loss, as good or, at the very least, necessary, in that they are among the facts of one’s life and existence, so they are always necessarily there whether one likes them or not.