战国时期，魏国有个公子名叫无忌。
他是魏安厘王的弟弟，非常仁爱有礼。
因此，很多贤士都来投靠他，他的门下有三千食客。
有一年，赵国被秦昭王攻打，赵惠文王的弟弟平原君的夫人是无忌的姐姐，所以她多次写信向魏王和无忌求救。
魏王派将军晋鄙带兵去救赵国，但秦昭王警告魏王，谁敢救赵国，就会先打谁。
魏王害怕了，就让晋鄙停下进军，只在邺城观察形势。
平原君的使者不断向无忌求救，并责备他说：“邯郸快被攻破了，你不顾我们赵国，难道不顾你姐姐吗？”
无忌很担心，多次请求魏王出兵，但魏王怕秦国，不愿听从。
这时，魏国有个隐士叫侯赢，是个看门人，平时受到无忌的尊重。
他知道无忌决心救赵国，便给他出了个主意。
无忌按照侯赢的计划，偷取了魏王的兵符，假传命令，夺了晋鄙的兵权，并杀了他。
然后，无忌挑选八万精兵，打败了秦军，解救了邯郸，保住了赵国。
赵王和平原君亲自到边界迎接无忌。
然而，魏王对无忌盗兵符、杀晋鄙很生气，无忌也知道这一点。
于是，他让部将带军队回魏国，自己留在赵国。
赵王想把五座城邑封给无忌作为感谢，但有人劝告无忌说：“有些事不能忘记，有些事要忘记。别人对你有恩，你要记住；你对别人有恩，希望你能忘记。虽然你救了赵国，但对魏国来说不是忠臣。你现在骄傲的样子不好。”
无忌听了后感到羞愧，觉得无地自容。
最后，他谦虚地谢绝了赵王的好意。
这就是“无地自容”这个成语的由来，意思是形容羞愧到了极点。
During the Warring States period, there was a prince in the state of Wei named Wuji.
He was the younger brother of King Anli of Wei and was known for his kindness and courtesy.
As a result, many wise men came to him, and he had three thousand guests under his roof.
One year, the state of Zhao was attacked by King Zhuangxiang of Qin. The wife of Prince Pingyuan of Zhao, who was also Wuji's sister, wrote several letters to King Wei and Wuji asking for help.
King Wei sent General Jinbi to lead an army to rescue Zhao, but King Zhuangxiang of Qin warned King Wei that anyone who dared to rescue Zhao would be attacked first.
King Wei was afraid and ordered Jinbi to stop advancing and only observe the situation at Ye City.
The messenger of Prince Pingyuan repeatedly asked Wuji for help and reproached him, saying, "Handan is about to fall, do you not care about our Zhao or your sister?"
Wuji was very worried and repeatedly asked King Wei to send troops, but King Wei was afraid of Qin and refused to listen.
At this time, there was a hermit in Wei named Houying, who was a gatekeeper and was respected by Wuji.
He knew that Wuji was determined to save Zhao, so he gave him an idea.
Wuji followed Houying's plan, stole King Wei's military seal, falsely issued orders, seized Jinbi's military power, and killed him.
Then, Wuji selected 80,000 elite soldiers, defeated the Qin army, rescued Handan, and saved Zhao.
King Zhao and Prince Pingyuan personally went to the border to welcome Wuji.
However, King Wei was angry with Wuji for stealing the military seal and killing Jinbi, and Wuji was aware of this.
So, he let his general take the army back to Wei, while he stayed in Zhao.
King Zhao wanted to give Wuji five cities as thanks, but someone advised Wuji, saying, "There are things you cannot forget and things you should forget. You should remember when others have done you favors, and hope that you can forget when you have done favors for others. Although you saved Zhao, you were not a loyal subject to Wei. Your proud appearance is not good now."
Wuji felt ashamed after hearing this, feeling ashamed to the core.
In the end, he humbly declined King Zhao's kindness.
This is the origin of the idiom 'ashamed to the core', which means extremely ashamed.
