Matthew 7:12

All things whatsoever ... - This command has been usually called the "Saviour' s golden rule," a name given to it on account of its great value. All that you "expect" or "desire" of others in similar circumstances, do to them. Act not from selfishness or injustice, but put yourself in the place of the other, and ask what you would expect of him. This would make you impartial, candid, and just. It would destroy avarice, envy, treachery, unkindness, slander, theft, adultery, and murder. It has been well said that this law is what the balance-wheel is to machinery. It would prevent all irregularity of movement in the moral world, as that does in a steam-engine. It is easily applied, its justice is seen by all people, and all must acknowledge its force and value.

This is the law and the prophets - That is, this is the sum or substance of the Old Testament. It is nowhere found in so many words, but if is a summary expression of all that the law required. The sentiment was in use among the Jews. Hillel, an ancient Rabbi, said to a man who wished to become a proselyte, and who asked him to teach him the whole law, "Whatever is hateful to you, do not do to another." Something of the same sentiment was found among the ancient Greeks and Romans, and is found in the writings of Confucius.