Summa Theologica

IIa IIae q. 110 : Of The Vices Opposed To Truth, And First Of Lying (Four Articles)

[Letter] [A4] Entire question
[Letter] [A4] 1. Whether lying is always opposed to truth?
[Letter] [A4] 2. Whether lies are sufficiently divided into officious, jocose, and mischievous lies?
[Letter] [A4] 3. Whether every lie is a sin?
[Letter] [A4] 4. Whether every lie is a mortal sin?