effective without any prove

I love the scene he got shot! It's the last scene in this part. The very last one. I wonder what would I do when I got shot by the life.
Nietzsche brings the idea of eternal return. In a very simple sense, if I live only once, I may not live at all. In other words, everything will happen when we experience it, and recurrence of it makes the return infinitely. Nietzsche proved it to himself in Thus Spoke Zarathustra, part III, chap. 2, #2, Of the Vision and the Riddle .
The beauty is he called it "The thought of eternal return". thoughts don't need to be proved to be effective.
I like it, and I believe in it. Even everything is a lie, and time is a circle!