The essence of this sentence is that you won't gain rich experience without losing money; Without serious losses, those experiences will not be engraved in my heart.
There are many gods in the bull market. If you are lucky, you can make profits several times in a row, but good luck will not always accompany you, and the bull market will not last forever.
The experience of success and failure gained from success and failure is the foundation of survival in this cruel market.