Relax. Self-knowledge. What do you mean?

Happy-go-lucky, knowing oneself in cold and warm are two idioms, which respectively mean:

Do sth gracefully

An: Enron, calm; Refers to: pronouns refer to people or things; Sue: Normal. Get along well, as always, and don't feel anything wrong.

Know whether it is cold or warm.

Only the drinker knows the temperature of water. Zen is used to describe his own realm of enlightenment. It is also used to describe the depth of his learning experience, which only he knows.

Together, it means to treat as usual. Zen is used to describe one's realm of enlightenment. It is also used to describe the depth of a person's learning experience, which only he knows. There is another saying, you will know it as soon as you drink water.