That phrase is a paraphrase of Luke 6:31...FROM JESUS...IN THE BIBLE!
LUKE 6:31
And as ye would that men should do to you, do ye also to them likewise.
also....
MATTHEW 5:38-48
Ye have heard that it hath been said, An eye for an eye, and a tooth for a tooth but I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also. And if any man will sue thee at the law, and take away thy coat, let him have thy cloak also. And whosoever shall compel thee to go a mile, go with him twain. Give to him that asketh thee, and from him that would borrow of thee turn not thou away. Ye have heard that it hath been said, Thou shalt love thy neighbor, and hate thine enemy. But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; that ye may be the children of your Father which is in heaven: for he maketh his sun to rise on the evil and on the good, and sendeth rain on the just and on the unjust. For if ye love them which love you, what reward have ye? do not even the publicans the same? And if ye salute your brethren only, what do ye more than others? do not even the publicans so? Be ye therefore perfect, even as your Father which is in heaven is perfect.
...and...
MATT 22:37-39
Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. This is the first and great commandment. And the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets.
(Now, granted, some of us don't believe in a Supreme Being so the first one is moot. However, the point still stands...LOVE EVERYONE)
Why must you LIE, Dr. Liar? Isn't there a COMMANDMENT against it? Was your brain replaced with sherbet? Are you from Bizarroworld?
(I wont let me post my edit)