Matthew 7:12-14 - The Golden Rule
12 All things therefore whatsoever ye would have men do to you, do ye also in like manner unto them: for this is the doctrine of the law and the prophets.
13 Enter ye in at the strait gate; for wide is the gate, and broad is the way, that leadeth to destruction, and many there be who go in thereat: 14 whereas the gate is narrow, and the way troublesome, which leadeth into life, and few there be that find it.