The fact that the Catholic church has no opposition to its practitioners working for bank/charging interest one loans and that the originally any such interest was sinful
Also, something to ponder, is that we are bound under assent of faith to the infallible pronouncements of several Ecumenical Councils which prohibit usury.
**The Third Lateran Council
Canons**
Nearly everywhere the crime of usury has become so firmly rooted that many, omitting other business, practise usury as if it were permitted, and in no way observe how it is forbidden in both the Old and New Testament.
**The Second Council of Lyons
Constitutions II
On usury **
Wishing to close up the abyss of usury, which devours souls and swallows up property, we order under threat of the divine malediction that the constitution of the Lateran council against usurers be inviolably observed.
Since the less convenient it is for usurers to lend, the more their freedom to practise usury is curtailed, we ordain by this general constitution as follows.
Neither a college, nor other community, nor an individual person, of whatever dignity, condition or status, may permit those foreigners and others not originating from their territories, who practise usury or wish to do so, to rent houses for that purpose or to occupy rented houses or to live elsewhere.
Nobody is to let houses to them for usury, nor grant them houses under any other title.
If the sum owing from usury is openly known, we wish this sum always to be expressed in the pledge, if the amount is not clearly known, the sum is to be determined by the receiver of the pledge.
Nobody is to assist at the wills of notorious usurers or hear their confessions or absolve them, unless they have made restitution for their usury or have given a fitting guarantee, as far as they can, as described above.
**The Council of Vienne
Decrees**
We therefore decree that in cases concerning elections, postulations, or provisions, concerning dignities, parsonages, offices, canonries, prebends or any other church benefices, concerning tithes, even when those obliged to pay them have been admonished and can be corrected by ecclesiastical censure, and concerning matrimony or usury and anything connected with it, that a simple, easy process shall be valid without the noise and rhetoric of a court of justice.
Serious suggestions have been made to us that communities in certain places, to the divine displeasure and injury of the neighbour, in violation of both divine and human law, approve of usury.
By their statutes, sometimes confirmed by oath, they not only grant that usury may be demanded and paid, but deliberately compel debtors to pay it.
We, therefore, wishing to get rid of these pernicious practices, decree with the approval of the sacred council that all the magistrates, captains, rulers, consuls, judges, counsellors or any other officials of these communities who presume in the future to make, write or dictate such statutes, or knowingly decide that usury be paid or, if paid, that it be not fully and freely restored when claimed, incur the sentence of excommunication.
Furthermore, since money-lenders for the most part enter into usurious contracts so frequently with secrecy and guile that they can be convicted only with difficulty, we decree that they be compelled by ecclesiastical censure to open their account books, when there is question of usury.
If indeed someone has fallen into the error of presuming to affirm pertinaciously that the practice of usury is not sinful, we decree that he is to be punished as a heretic; and we strictly enjoin on local ordinaries and inquisitors of heresy to proceed against those they find suspect of such error as they would against those suspected of heresy.
They sometimes meddle with settlements involving usury or unjust acquisition and the restitution to be made.
**The Council of Basel
Union with Greeks, Conversion of Pagans**
But if his goods were acquired by usury or illicit dealings, and the persons to whom restitution ought to be made are known, it is absolutely necessary that this restitution be made, since the sin is not forgiven unless the illegal object is restored.
**The Fifth Lateran Council
On Reforms and the Pragmatic Sanction**
For this reason they cannot avoid the crime of usury or injustice, that is to say a clearly defined evil, since our Lord, according to Luke the evangelist, has bound us by a clear command that we ought not to expect any addition to the capital sum when we grant a loan.
For, that is the real meaning of usury: when, from its use, a thing which produces nothing is applied to the acquiring of gain and profit without any work, any expense or any risk.
We commend the zeal for justice displayed by the former group, which desires to prevent the opening up of the chasm of usury, as well as the love of piety and truth shown by the latter group, which wishes to aid the poor, and indeed the earnestness of both sides.
– Nicole