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Forgiveness is a law of nature.
A sixth law of nature is this: that upon caution of the future time, a man ought to pardon the offences past of them that, repenting, desire it. For pardon is nothing but granting of peace; which though granted to them that persevere in their hostility, be not peace, but fear; yet not granted to them that give caution of the future time is sign of an aversion to peace, and therefore contrary to the law of nature.
Hobbes, Lev XV 18