Please help me to see what this sentence means.

See through the world, overcome it, and know what is desirable and what is not.

Let nature take its course and be happy forever.

Don't set yourself too high a goal, don't be stingy with the benefits you get in this world, and don't covet what others get. The world is rich, and even this body is like a cloud to me.

(My own understanding, talk nonsense, hehe)