Morality doesn't mean ‘following divine commands'. It means ‘reducing suffering'. Hence in order to act morally, you don't need to believe in any myth or story. You just need to develop a deep appreciation of suffering.

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Morality doesn’t mean ‘following divine commands’. It means ‘reducing suffering’. Hence in order to act morally, you don’t need to believe in any myth or story. You just need to develop a deep appreciation of suffering.
― Yuval Noah Harari, 21 Lessons for the 21st Century