Whether it is a sin to take usury for money lent?

Objections

Objection 1 : It would seem that it is not a sin to take usury for money lent. For no man sins through following the example of Christ. But Our Lord said of Himself (Lk. 19:23): "At My coming I might have exacted it," i.e. the money lent, "with usury." Therefore it is not a sin to take usury for lending money.
Objection 2 : Further, according to Ps. 18:8, "The law of the Lord is unspotted," because, to wit, it forbids sin. Now usury of a kind is allowed in the Divine law, according to Dt. 23:19,20: "Thou shalt not fenerate to thy brother money, nor corn, nor any other thing, but to the stranger": nay more, it is even promised as a reward for the observance of the Law, according to Dt. 28:12: "Thou shalt fenerate* to many nations, and shalt not borrow of any one." [*'Faeneraberis'---'Thou shalt lend upon usury.' The Douay version has simply 'lend.' The objection lays stress on the word 'faeneraberis': hence the necessity of rendering it by 'fenerate.'] Therefore it is not a sin to take usury.
Objection 3 : Further, in human affairs justice is determined by civil laws. Now civil law allows usury to be taken. Therefore it seems to be lawful.
Objection 4 : Further, the counsels are not binding under sin. But, among other counsels we find (Lk. 6:35): "Lend, hoping for nothing thereby." Therefore it is not a sin to take usury.
Objection 5 : Further, it does not seem to be in itself sinful to accept a price for doing what one is not bound to do. But one who has money is not bound in every case to lend it to his neighbor. Therefore it is lawful for him sometimes to accept a price for lending it.
Objection 6 : Further, silver made into coins does not differ specifically from silver made into a vessel. But it is lawful to accept a price for the loan of a silver vessel. Therefore it is also lawful to accept a price for the loan of a silver coin. Therefore usury is not in itself a sin.
Objection 7 : Further, anyone may lawfully accept a thing which its owner freely gives him. Now he who accepts the loan, freely gives the usury. Therefore he who lends may lawfully take the usury.