What does the egg in the stone mean?

Touch a stone with an egg. To make a metaphor, you don't estimate your own strength and bring yourself to destruction.

On one occasion, Xunzi and Lin, the general of Chu, talked about military affairs. Lin said, "Those who are good at using troops, who are good at' attacking' and cheating, can be invincible in the world." Xunzi is different from Yilin's point of view. He opposes cheating and advocates "soldiers are benevolent". He said, "If the unjust division of a tyrant is stubborn, then the main strategy is' attack and deception'. As soon as I entered, I was burned. " Mozi returned to righteousness and said "throw an egg at a stone". Mo Zhai, the author of Mozi, was born in Song Dynasty in the early Warring States Period. On one occasion, Mozi went to Qi in the north. On the way, he met a fortune teller and said to Mozi, "According to my calculation, there is no darkness in the north today, only your face. Mozi didn't listen at all. But the fortune teller insisted on his fallacy and discouraged Mozi. Finally, Mozi said firmly: "What you said is fallacy, and what I said is truth. If you want to deny the truth with fallacies, it is tantamount to' throwing eggs at stones' and you are doomed to failure! " After that, Mozi ignored the fortune teller and went straight to Qi in the north. This idiom refers to the disparity between the strong and the weak, and attacking the strong with the extremely weak is bound to fail.