The Name Rule in Japanese/Chinese on a Custom-Made Wall Scroll.

魯爾 is the name Rule in Chinese (Mandarin).

ルール is the name Rule in Japanese Katakana.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

Some may think of this as a “Christian trait,” but actually, it transcends many religions.

This Chinese teaching dates back to about 2,500 years ago in China. Confucius had always taught the belief in being benevolent (ren), but this idea was hard to grasp for some of his students, as benevolence could be kind-heartedness or an essence of humanity itself.

When answering Zhong Gong's question as to what "ren" actually meant, Confucius said:

己所不欲勿施于人 or "When you go out, you should behave as if you were in the presence of a distinguished guest; when people do favors for you, act as if a great sacrifice was made for you. Whatever you wouldn't like done to you, do not do that thing to others. Don't complain at work or home.”

Hearing this, Zhong Gong said humbly, “Although I am not clever, I will do what you say.”

From this encounter, the Chinese version of the “Golden Rule” or “Ethic of Reciprocity” came to be.
The characters you see above express, “Do not do to others whatever you do not want to be done to yourself.”

See Also:  Confucius Teachings | Benevolence

黄金律 is “The Golden Rule” in Japanese.

It's understood to mean “do unto others as you would have them do unto you.”