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”This is what sets human morality apart: a move towards universal standards combined with an elaborate system of justification, monitoring and punishment.
At this point, religion comes in. Think of the narrative support for compassion, such as the Parable of the Good Samaritan, or the challenge to fairness, such as the Parable of the Workers in the Vineyard, with its famous conclusion “The last will be first, and the first will be last.” Add to this an almost Skinnerian fondness of reward and punishment — from the virgins to be met in heaven to the hell fire that awaits sinners — and the exploitation of our desire to be “praiseworthy,” as Adam Smith called it. Humans are so sensitive to public opinion that we only need to see a picture of two eyes glued to the wall to respond with good behavior, which explains the image in some religions of an all-seeing eye to symbolize an omniscient God
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Morals Without God? - Frans de Waal (The New York Times - Opinions Pages)