When the sun reaches its zenith, it must begin to decline; metaphorically, things reach their peak and then inevitably decline or turn to their opposite.
古人常说日中必昃，月盈则亏，所以我们对待成功也要保持谦逊，不要得意忘形。
The ancients often said that when the sun reaches its zenith, it must decline, and when the moon is full, it must wane; therefore, we should remain humble when facing success and not become complacent.
Next Idiom