Time can prove natural history and social history, whether a person's heart is sincere and whether a person's life is valuable. But time can't tell everything, because there are all kinds of people in the world and their thoughts are changing. Good people can become bad people, and bad people can also become good people. Only when a person leaves this world can he prove his value, and when a society dies, can he prove the good or bad of this society. Time can prove everything and dilute everything. Is there no time to prove it from our youth to adulthood? Once those who thought they could never walk out of sadness, can they still let themselves die again now? If these are not time, what can they be? So when we are sad, we will say "I hope time will pass quickly", and when we are happy, we will say "I hope time will stop here"