"It must be said that charity can, in no way, exist along with mortal sin."

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Charity is not a potency of the soul, because if it were it would be natural. Nor is it a passion, because it is not in a sensitive potency in which are all passions. Nor is it a habit, because a habit is removed with difficulty; charity, however, is easily lost through one act of mortal sin. Therefore charity is not something created in the soul.

— Thomas Aquinas