"The only way we can leave the pain or sin from our past is to face it with Christ. For the past cannot be forgotten, it can only be forgiven and redeemed."

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It would seem that the ingratitude, whereby a subsequent sin causes the return of sins previously forgiven, is a special sin. For, the giving of thanks belongs to counter passion, which is a necessary condition of justice. But justice is a special virtue. Therefore this ingratitude is a special sin. Thanksgiving is a special virtue. But ingratitude is opposed to thanksgiving. Therefore ingratitude is a special sin.

— Thomas Aquinas