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Thomas Aquinas:
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.
Albert Barnes:
We can always find something to be thankful for, and there may be reasons why we ought to be thankful for even those dispensations which appear dark and frowning.
Henry Ward Beecher:
The unthankful heart… discovers no mercies; but let the thankful heart sweep through the day and, as the magnet finds the iron, so it will find, in every hour, some heavenly blessings!
William Faulkner:
Gratitude is a quality similar to electricity: it must be produced and discharged and used up in order to exist at all.
