In the payment of earthly riches the debtors are obliged only to strictness. Whatever they receive, so much must they return, nothing more is required of them. But with regard to the words of God, we are not only bound diligently to keep, but we are commanded to increase; and hence it follows, that at my coming I might have required the same with usury.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).