He can't sleep and feels carefree. If his life is floating, his death will stop. Where did it come from?

From "Zhuangzi Waipian" deliberately fifteen.

The original text is:

Therefore, the life of a saint is heaven, and death is materialization. Static and yin are concentric, while dynamic and yang are in the same wave. Not for happiness, not for disaster. I feel like I have to follow, force myself to walk, and force myself to get up. Know the past, never forget the future, and avoid justice. So there is no natural disaster, no material fatigue, no blame, no ghost responsibility. If his life is floating, if his death is still. No thoughts, no plans. The light is not shining, but the faith is unexpected. He sleeps without dreaming, and he feels carefree. Its god is pure, but its soul will not stop. Nothing is indifferent, but in harmony with the sky.