不言而谕 Self-evident
Explanation
不用说话就能明白。形容道理很明显。
It can be understood without speaking. It describes that the reason is very obvious.
Origin Story
话说唐朝时期，有个名叫李白的诗人，才华横溢，诗作流传至今。有一天，李白来到一个村庄，发现村民们都愁眉苦脸的，于是他便上前询问缘由。村民们告诉李白，他们村里的井枯竭了，没有水源灌溉庄稼，眼看就要颗粒无收。李白听后，并没有多说什么，只是抬头望了望天，又看了看周围的环境，然后转身就走。村民们都很疑惑，不知道李白葫芦里卖的什么药。这时，一个老农突然指着李白离去的方向说："快看，天上的云彩！"村民们顺着老农的手指望去，只见天空中乌云密布，一场大雨即将到来。村民们顿时明白了李白的用意：李白并没有直接告诉他们解决方法，而是通过观察天象，让他们自己明白即将到来的雨水就能解决他们的问题。这件事，不言而谕，大家都懂了。
It is said that during the Tang Dynasty, there was a poet named Li Bai, who was exceptionally talented and whose poems have been passed down to this day. One day, Li Bai came to a village and found that the villagers were all frowning, so he went up to inquire about the reason. The villagers told Li Bai that the well in their village had dried up, there was no water source to irrigate the crops, and they were about to have a poor harvest. After hearing this, Li Bai didn't say much, but just looked up at the sky, and then looked around, then turned and left. The villagers were all very puzzled, not knowing what Li Bai was up to. At this time, an old farmer suddenly pointed in the direction where Li Bai had left and said, "Look, the clouds!" The villagers followed the old farmer's finger and saw that dark clouds were gathering in the sky, and a heavy rain was about to come. The villagers immediately understood Li Bai's intention: Li Bai did not directly tell them the solution, but by observing the celestial phenomena, let them understand for themselves that the rain that was about to come would solve their problems. This incident, without saying a word, everyone understood.
Usage
用作谓语、定语；指事理非常明显。
Used as predicate and attributive; refers to the logic being very clear.
Examples
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会议结束，他一句话也没说就走了，其用意不言而谕。
huiyi jieshu, ta yijuhuayemingshuo jiu zou le, qi youyi buyaneryu.
The meeting ended, he left without saying a word, his intention was self-evident.
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从他的表情就能看出，他已经生气了，不言而谕。
cong ta de biaqing jiu keichu, ta yijing shengqi le, buyaneryu.
From his expression, you can see that he is already angry, it goes without saying.