Necessity

"The formula for greatness in man is AMOR FATI".
[Nietzsche, EH]

'Amor fati' means 'love of one's Fate';

"Every man is himself a piece of Fate".[Nietzsche, WS 229]

And what is this fate that we should love?;"The Destiny of the Higher Man is to be a Creator".[Nietzsche, TSZ L]

This concept of destiny pervades the philosophy;

"Let us be on our guard against saying that there are laws in nature. There are only necessities".[Nietzsche JW 109]

"Everything happens just as it ought to happen".[Nietzsche WM 1004]