Matthew 7:12-14 - The Golden Rule
12 Therefore all things whatever ye desire that men should do to you, thus do ye also do to them; for this is the law and the prophets.
13 Enter in through the narrow gate, for wide the gate and broad the way that leads to destruction, and many are they who enter in through it. 14 For narrow the gate and straitened the way that leads to life, and they are few who find it.