"Is there any one maxim which ought to be acted upon throughout one's whole life? Surely the maxim of loving kindness is such: Do not unto others what you would not they should do unto you."

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If for just the time of a finger-snap a monk produces a thought of loving-kindness, develops it, gives attention to it, such a one is rightly called a monk. Not in vain does he meditate. He acts in accordance with the master's teaching, he follows his advice. How much more so if he cultivates it.

— Gautama Buddha