Part 8 is short and beautiful. It's one of my favourites:
Seek not that the things which happen should happen as you wish; but wish the things which happen to be as they are, and you will have a tranquil flow of life.
This is the core principle of Stoicism, phrased in a slighly different, and more poetic, way. Do no try and control the world, you will fail, and be disappointed. Accept what you can't control and you will live in peace.
I find it interesting that this takes things a step further than acceptance of things out of our control: wish the things which happen to be as they are.