不二法门 The only true gate
Explanation
不二法门，意指最直接、最好的方法。原为佛教术语，指无需任何辅助，直接达到目的的修行方法。后泛指最好的或独一无二的方法。
The term "bu er fa men" means the most direct and best way. Originally a Buddhist term referring to a method of practice that achieves the goal directly without any assistance. Later, it is generally used to refer to the best or unique way.
Origin Story
传说，在古代，有一个名叫张三的人，一直苦苦追寻成仙之道，他走遍了名山大川，拜访了无数的仙人，却始终没有找到正确的道路。一天，他遇到了一位高僧，高僧告诉他，成仙之道并非是多么高深的秘诀，而是有一个不二法门。张三问：“不二法门是什么？”高僧微微一笑，指着自己的心说：“心即是道，道即是你，你不必再外求。”张三恍然大悟，从此精进修行，终于得道成仙。
Legend has it that in ancient times, there was a man named Zhang San who was always searching for the way to become an immortal. He traveled through mountains and rivers, visited countless immortals, but still couldn't find the right path. One day, he met a high monk, who told him that the way to become an immortal was not a deep secret, but there was a single, infallible path. Zhang San asked,
Usage
“不二法门”常用来指代最好的、最直接的方法，多用于强调某件事或某项技能的关键点。
“Bu er fa men” is often used to refer to the best and most direct method, often to emphasize the key points of something or a skill.
Examples
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学习书法，临帖是最不二法门。
xue xi shu fa, lin tie shi zui bu er fa men.
Practicing calligraphy, copying ancient models is the best way.
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创业初期，选择合适的项目是成功的不二法门。
chuang ye chu qi, xuan ze shi he de xiang mu shi cheng gong de bu er fa men
In the early stage of starting a business, choosing the right project is the key to success.