As a bystander, other people's affairs are someone else's after all. If he is happy, you feel happy, and if he is in pain, you will also suffer. That's it. You won't think about the happy times and the painful times from time to time, because those are just One of the many things that happened around you, you will be moved by the time, but you will not feel the same way;
as a participant, you will be happy when you see the happy things when your dearest people are in despair. It will be sad, because there will be no such opportunities in the future; if you lose, you will lose, and you will not make yourself better because others have the same tragic thing.
Cherish the people around you, don't feel that there is a lot of time, accidents really happen at any time.
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