It means that a little light emitted by a small firefly can't be compared with the brilliance of the sun and the moon at all. The brilliance of the sun and the moon is unparalleled. Fireflies compete with the sun and the moon for glory, just like ephemera shaking trees, which is often compared to overreaching.
Extended data:
During Zhuge Liang's Northern Expedition, regardless of his 76-year-old age, Wang Lang met Zhuge Liang with Cao Zhen and others in Qishan. He provoked a war of words with Zhuge Liang before the war, but was refuted by Zhuge Liang's words He fell off his horse and died in anger. Known as "Wuxiang Hou cursed Wang Lang to death".
There are other sayings. Do you dare to compete with the sun and the moon with an inch of candlelight? Dare the light of a small candle compare with that of the sun and the moon?
How dare an ant's life coexist with the world?
How can a buffoon be elegant in the lobby?