开门揖盗 open the door to invite thieves
Explanation
比喻引进坏人，招来祸患。
It means to invite bad people and bring disaster.
Origin Story
话说东汉末年，孙策征战四方，功勋赫赫。然而，他得罪了吴郡太守许贡。许贡怀恨在心，暗中勾结刺客，意图刺杀孙策。孙策虽侥幸躲过一劫，但却身受重伤，不久便去世了。临终前，他将大权托付给了弟弟孙权。孙权年少，朝中大臣忧心忡忡，其中张昭便劝谏孙权：‘现在正值乱世，奸邪小人众多，如果我们过于悲伤，耽误了国家大事，那就是开门揖盗，自招祸患。’孙权听后深受感动，强忍悲痛，励精图治，最终成就了孙吴霸业。这个故事告诉我们，在面临困境时，要冷静处理，切莫因一时的情绪而做出错误的决定，否则只会引狼入室，自食恶果。
In the late Eastern Han Dynasty, Sun Ce, a renowned general, had offended Xu Gong, the governor of Wu County. Xu Gong harbored resentment and secretly hired assassins to kill Sun Ce. Though Sun Ce managed to escape, he suffered serious injuries and died shortly after. On his deathbed, he entrusted his power to his younger brother, Sun Quan. Sun Quan was young, and the court officials were worried. Zhang Zhao cautioned Sun Quan: "In these turbulent times, there are many wicked people. If we are too consumed by grief and neglect state affairs, it will be as if we open the door to thieves, inviting disaster." Sun Quan was moved and suppressed his grief. By ruling diligently and effectively, he eventually established the powerful Wu kingdom. This story shows us the importance of maintaining composure in adversity; emotional decisions could easily lead to disaster and ruin.
Usage
用来比喻引进坏人，招致祸患。
It is used to describe inviting bad people and bringing disaster.
Examples
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他为了个人利益，竟然开门揖盗，引狼入室，最终害了大家。
ta wei le geren liyi, jingran kaimen yidao, yinlang rushi, zhongyu haile dajiya.
He opened the door to thieves for his own benefit, bringing disaster to everyone.
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某些人为了眼前的蝇头小利，不惜开门揖盗，最终只会损人害己。
mouxie ren wei le yanqian de yingtou xiaoli, buxi kaimen yidao, zhongyu zhihui sunren hai ji
For a little bit of petty gain, some people would even open the door to thieves, and in the end it will only harm others and themselves.