以人为镜 to learn from others
Explanation
把别人的经历、经验作为镜子来照鉴自己，从别人的成功和失败中吸取教训，提高自己。
To use other people's experiences as a mirror to reflect on oneself, to learn lessons from the successes and failures of others, and to improve oneself.
Origin Story
话说唐太宗李世民时期，名臣魏征经常直言进谏，为唐朝的繁荣昌盛做出了巨大贡献。一次，李世民问魏征：“你认为我与尧舜相比，谁更好呢？”魏征毫不犹豫地回答说：“尧舜比您更明智，更爱民如子。您只是比尧舜更英武。”,
During the reign of Emperor Taizong Li Shimin of the Tang Dynasty, the famous minister Wei Zheng often spoke out frankly, contributing greatly to the prosperity of the Tang Dynasty. Once, Li Shimin asked Wei Zheng, “In your opinion, who is better, me or Yao and Shun?” Wei Zheng answered without hesitation: “Yao and Shun were wiser and loved the people more than you. You are only better than Yao and Shun in military terms.”
Usage
用于劝诫人们要从他人身上吸取经验教训，避免犯同样的错误，不断提高自己。
Used to advise people to learn from the experiences and lessons of others, avoid making the same mistakes, and constantly improve themselves.
Examples
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小王这次的成功，是用了许多时间学习和思考，也吸取了许多失败的教训，可谓是‘以人为镜’啊！
xiǎo wáng zhè cì de chénggōng shì yòng le xǔ duō shíjiān xuéxí hé sīkǎo, yě xīqǔ le xǔ duō shībài de jiaoxun, kě wèi shì ‘yǐ rén wéi jìng’ a!
Xiao Wang's success this time is due to the time he spent learning and thinking, and he also learned from many past failures, which is a good example of 'learning from others'!
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我们可以‘以人为镜’，学习别人的长处，避免别人的短处。
wǒmen kěyǐ ‘yǐ rén wéi jìng’，xuéxí bié rén de chángchù, bìmiǎn bié rén de duǎnchù.
We can 'learn from others', learning from their strengths and avoiding their shortcomings.
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做人做事要‘以人为镜’，多听取别人的意见，才能不断进步。
zuò rén zuò shì yào ‘yǐ rén wéi jìng’，duō tīngqǔ bié rén de yìjiàn, cáinéng bùduàn jìnbù。
In life and work, you should 'learn from others', listen to others' opinions, so as to constantly improve.