About 20 years before the birth of Jesus, the two most prominent Jewish rabbis were named Shammai and Hillel. One day, a Gentile approached the two of them with this challenge: “I challenge you to summarize the teachings of your religion while standing upon one foot.”

Shammai dismissed him with the words, “You don’t know what you are asking.”

The questioner looked at Hillel and gave the challenge again. Hillel stood upon one foot and said, “Whatever is hateful to you, do not do to another. That is the whole law, and all else is commentary.”