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In literature, a moral universe is the moral nature of the universe as a whole in relation to human life, or a specific moral code.
A moral universe implies that we live in a basically spiritual universe that is somehow ordered by a higher power, by invisible feelings of good and bad, a 'cosmic order' reminiscent of the early Greeks  that underpins and motivates our actions. Or a 'moral force' that means our actions must have definite effects which we carry with us. In this respect its meaning comes close to the Hindu concept of Karma.
Those who reject this idea tend to believe that the universe is just physical, has no spiritual component at all, that events are random and have no deeper meaning or purpose, and that there can be no consequences of any kind to our actions and thus that we live in an amoral or nihilistic universe, as in Nietzsche's "God is dead," aphorism. Such might be the position of "anti-moral free spirits-nihilists."
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