不言而喻 It goes without saying
Explanation
不言而喻指的是不用说就能明白，形容道理很明显。这个成语的含义是，有些事情非常明显，不需要用语言来解释，就能让人明白。它表达了事物本身的清晰度和显而易见性。
"Bù yán ér yù" means that something can be understood without words and indicates a very obvious truth. It describes situations where the meaning of something is so clear that no further explanation is needed.
Origin Story
战国时期，孟子认为仁义礼智是君子天生的秉性，君子在得志时不妄为，在困穷失意时不自卑，他敬天知命，将仁义礼智铭记在心，并将它发扬光大，不但能将它们表现在脸上，照到背上，然后传到四肢，四肢就不言而喻可以找到其法门了。
During the Warring States period, Mencius believed that benevolence, righteousness, propriety, and wisdom were the innate qualities of a gentleman. A gentleman, when successful, does not act rashly, and a gentleman who lives in poverty and disappointment is not self-indulgent. He respects Heaven, knows his fate, and holds the virtues of benevolence, righteousness, propriety, and wisdom in high esteem and develops them further. Not only in his face, but also on his back, and even in his limbs, the meaning of these virtues is clearly shown, and so one easily finds the way to apply them.
Usage
这个成语主要用于表达事情显而易见、无需解释就能明白。常用于描述一些无需多言就能理解的道理、情况、事实等。
This idiom is mainly used to express that something is obvious and can be understood without explanation. It is often used to describe truths, situations, or facts that can be understood without further words.
Examples
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他为人正直，待人诚恳，他的善良不言而喻。
ta wei ren zheng zhi, dai ren cheng ken, ta de shan liang bu yan er yu.
His honesty and sincerity to others are self-evident.
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他的实力非常强大，赢得了比赛，这已经是众所周知的事情，不言而喻。
ta de shi li fei chang qiang da, ying de le bi sai, zhe yi jing shi zhong suo zhi zhi de shi qing, bu yan er yu.
His strength is very strong, he won the game, which is already a well-known fact, it goes without saying.
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从他的言行举止中，不言而喻，他已经爱上了她。
cong ta de yan xing ju zhi zhong, bu yan er yu, ta yi jing ai shang le ta.
From his words and deeds, it goes without saying, he has fallen in love with her.
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这道题的答案不言而喻，只要稍微思考一下就能明白。
zhe dao ti de da an bu yan er yu, zhi yao shao wei si kao yi xia jiu neng ming bai.
The answer to this question is obvious, you can understand it with a little thought.
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他的才华不言而喻，他创作的作品深受人们喜爱。
ta de cai hua bu yan er yu, ta chuang zuo de zuo pin shen shou ren men xi ai.
His talent is self-evident, and his works are loved by the people.