How can you see a rainbow without experiencing wind and rain?

The sun always comes after the storm.

The life of struggle will make you capable, and the suffering of depression will make you mature; these are the two magic weapons that the times must prepare young people to shoulder the historical mission. Author: Mao Dun

In ancient times, those who accomplished great things must not only have extraordinary talents, but also must have perseverance.

This quote comes from Su Shi's "Huang Cuo Lun" in the Song Dynasty.