In the ups and downs of life, there are always too many things that need time and space to cleanse and refine. When experiencing it, you only know the bitterness, joy, sourness, and sweetness. Only afterwards can you understand the various aspects of life and summarize how you should have faced it in the first place. This is the paradox of life, just like when we have something, we always complain about what we don't have, but when we lose it, we forget what we once had; we are afraid of time, but we don't know how joyful it is to be alive. We think that survival is meaningless, but many people are struggling between life and death.