I found a perfect answer to this question in a book.

Those who died yesterday may still be planning for tomorrow, those who died in the morning may still be planning for the night, maybe in a flash, everything will be gone, you never know what will happen next.

People in this life are always waiting, waiting for the future, waiting for not busy, waiting for money, but when we wait until later, there are only regrets. We are too busy to enjoy, we ignore too much love and be loved, so please be kind to yourself.

Tell you a little-known secret: in fact, the world is you alone, you are in the world, you are gone, the world is gone.

We always think that there is a long time to come, but in reality the world is unpredictable.