Impermanence-everything is constantly changing, and the only unchanging truth in this world is "change".
Everything is bitter-because I don't understand the laws of natural life in the universe, and everything people come into contact with will bring him pain.
All laws have no self-in fact, all the ingredients in the world have their reasons, not because of the existence of "I", and "I" is not "I", but only a part of this objective existence.
Keeping silent is interesting-if you understand all the above, what is going on and how to deal with it, then you will get fundamental happiness!