Summa Theologica by St. Thomas Aquinas
SS: Treatise On The Cardinal Virtues
Q[98] Of Perjury
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Prologue   A[1]   A[2]   A[3]   A[4]  

We must now consider perjury: under which head there are four points of inquiry:

A[1] Whether falsehood is necessary for perjury?

A[2] Whether perjury is always a sin?

A[3] Whether it is always a mortal sin?

A[4] Whether it is a sin to enjoin an oath on a perjurer?