A human being needs to suffercWhen one suffers， one becomes strong.
The most beautiful people are those who have known defeat, known suffering, known struggle, known loss, and have found their way out of the depths.
释义：他认为气不仅是万物的起源，也是万物的归宿，万物在气的循环中生生不息。
It may be unfair, but what happens in a single day can change the course of a whole lifetime.