Born in the world, everything in the world is mutual, and this mutual is all-round and inevitable.
Since it is inevitable, it is sweet.
Buddha said: born in the world, everyone has three difficulties, and no one can escape. One is worrying about money, the other is worrying about things, and the third is suffering from feelings. The road of life is not straight and complete, and there will always be injuries and defects. But experience can make people mature, grow up, learn to look at the world optimistically, and everything will pass.