PITHY QUOTES FROM PAST MASTERS
But, it is asked: Why is it usury to recieve money for the loan of money and not usury to receive money for the loan of clothing or a horse or a house? I say, that in the case of clothing or the horse or house, the use is drawn from the thing itself and not from the money, therefore it is not called usury. Some people believe that usury is evil because it is prohibited, but clearly it is prohibited because it is evil.
The Works of St. Bonaventure. Collations on the Ten Commandments. Collation VI