Matthew 7:12-14 - The Golden Rule
12 Let your actions be such, with regard to others, as you should think reasonable with regard to yourselves, for this is the substance of the law and the prophets.
13 Enter ye in at the strait gate; the gate that leadeth to destruction is broad, and the way is open, and they who pass through are numerous. 14 but the gate which leads to life is narrow, and the way is difficult, and few there be that find it.