Summa Theologica

IIa IIae q. 78 : Of The Sin Of Usury (Four Articles)

[Letter] [A4] Entire question
[Letter] [A4] 1. Whether it is a sin to take usury for money lent?
[Letter] [A4] 2. Whether it is lawful to ask for any other kind of consideration for money lent?
[Letter] [A4] 3. Whether a man is bound to restore whatever profits he has made out of money gotten by usury?
[Letter] [A4] 4. Whether it is lawful to borrow money under a condition of usury?