Change is the unchangeable truth. Everything in the world is changing, times have changed, and things have changed. Truth will not come from nothing, and then from nothing. Only the truth enters my memory from outside my memory, and then comes out of my memory from inside my memory. When you used to remember but don't remember now, you don't remember now. This is called "forgetting", so what is "forgetting"? You said, I forgot. How do you know you forgot? How do you know you forgot? Forgetting is forgetting. How can you remember "I forgot"? When you say "forget", do you mean "remember once, but don't remember now"? That's called "forgetting" Then you remember that you clearly "once remembered". If you remember "you clearly remembered", it means that you really forgot. Because you not only remembered the demerit, but also remembered "You used to remember the demerit"! This is "remember to remember". "Remember what I remember" is not "forget", then I remember "I used to remember". Why don't I remember now? If you remember before and don't remember now, then what you don't remember now will run out of memory. I remember what I used to remember, but now it's not in my memory, which means there is still room in your memory. In this way, what changes is not the truth, but your space for "knowledge" and "memory" of the truth. So the truth is unchangeable, and the unchangeable is the truth. Knowledge and memory of truth will change. I changed from "I don't know" to "I know", from "I remember" to "I don't remember" and from "the space without memory" to "the space with truth in memory". In this way, I am changing, not the truth! When I continue to push this similar logic, you will find that we are not the subject. Although we often say that we have "subjective truth" and "I have experienced this myself", in the whole range of truth, people's understanding of truth only proves that people are objects rather than subjects. Then, truth becomes the content to increase our knowledge, enjoy and enrich our life.