Part Ia IIaeHuman ActsQuestion 21
Consequences of Good and Evil Acts
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Since the eternal law is the ultimate norm of good or evil in human acts, it follows that moral evil is sinful, and moral goodness is righteous.
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It also follows that morally good acts are praiseworthy, and morally evil acts are blameworthy.
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The praise or blame due to human acts by reason of their moral goodness or badness is not a mere matter of words or opinions, but of retribution according to the demands of justice. That is, human acts have merit or demerit according to their goodness or evil.
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The merit and demerit of human acts are not a matter of human justice merely, but of divine justice; human acts have merit or demerit in the sight of God.
Full Summa Text · I-II, Q. 21
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