Summa Theologiae by St. Thomas Aquinas
SS: Treatise On The Cardinal Virtues
Q[107] Of Ingratitude
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We must now consider ingratitude, under which head there are four points of inquiry:

A[1] Whether ingratitude is always a sin?

A[2] Whether ingratitude is a special sin?

A[3] Whether every act of ingratitude is a mortal sin?

A[4] Whether favors should be withdrawn from the ungrateful?