Summa Theologica by St. Thomas Aquinas
SS: Treatise On The Cardinal Virtues
Q[110] Of The Vices Opposed To Truth, And First Of Lying
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We must now consider the vices opposed to truth, and (1) lying: (2) dissimulation or hypocrisy: (3) boasting and the opposite vice. Concerning lying there are four points of inquiry:

A[1] Whether lying, as containing falsehood, is always opposed to truth?

A[2] Of the species of lying;

A[3] Whether lying is always a sin?

A[4] Whether it is always a mortal sin?