"Monks, whatsoever grounds there be for good works undertaken with a view to [favorable] rebirth, all of them are not worth one-sixteenth part of that goodwill which is the heart's release; goodwill alone, which is the heart's release, shines and burns and flashes forth in surpassing them."
"Hurt not others in ways that you yourself would find hurtful. One should seek for others the happiness one desires for one's self"
Tripitaka Udana-Varga 5:18 (~500 BC)
"All beings tremble before violence. All fear death. All love life. See yourself in others. Then whom can you hurt? What harm can you do?"