天经地义 Natural law
Explanation
天经地义是一个成语，意思是天地间历久不变的常道，指绝对正确，不能改变的道理。也指理所当然的事。
Tianjing Diyi is a Chinese idiom, which means the unchanging way of heaven and earth, referring to the absolutely correct and unchangeable truth. It also refers to something that is natural and proper.
Origin Story
很久以前，在一个偏远的小村庄里，住着一位善良的老人。老人一生勤俭节约，虽然家境贫寒，却乐于助人。村里人有什么困难，他都会尽力帮助。 有一年，村里发生了洪灾，许多村民的房屋被冲毁，家园被淹没。老人看到村民们失去家园，心中十分难过。他把自己仅有的一点粮食和钱财都拿出来，分给受灾的村民，并帮助他们重建家园。 村民们看到老人如此无私的奉献，都非常感动，纷纷称赞老人是天经地义的好人。 老人笑着说：“帮助需要帮助的人是天经地义的事，这是每个人的责任。
Long ago, in a remote village, there lived a kind old man. The old man had lived a simple and frugal life, and though he was poor, he was always willing to help others. If the villagers had any difficulties, he would do his best to help them. One year, there was a flood in the village, and many villagers' homes were destroyed and their homes flooded. The old man was very sad to see the villagers lose their homes. He took out all of his food and money and distributed it to the affected villagers. He also helped them rebuild their homes. The villagers were very moved when they saw the old man's selfless dedication, and praised him as a naturally good person. The old man smiled and said: “It is only natural to help those in need. It is everyone's responsibility.”
Usage
天经地义常用于表达理所当然，不可违背的道理，强调行为的正当性，例如：
Tianjing Diyi is often used to express what is natural and proper, and cannot be violated. It emphasizes the legitimacy of behavior, for example:
Examples
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帮助需要帮助的人是天经地义的事。
bang zhu xu yao bang zhu de ren shi tian jing di yi de shi.
It is only natural to help those in need.
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维护正义，打击犯罪是天经地义的。
wei hu zheng yi, da ji fan zui shi tian jing di yi de.
It is only natural to uphold justice and combat crime.