道可道非常道名非名非常名

This is a famous quote from the Dao De Jing, an ancient Chinese text. It can be translated as "The Tao that can be spoken is not the eternal Tao; The name that can be named is not the eternal name." It expresses the idea that the true nature of the universe and reality cannot be fully captured by language or concepts. The "Tao" refers to the natural order of the universe and the path to living in harmony with it.