Ambrose of Milan : [Scripture] orders money to be returned without usury. It is a mark of kindly feeling to help one who has nothing. It is a sign of a hard nature to extort more than one has given. If one has need of your assistance because he has not enough of his own wherewith to repay a debt, is it not a wicked thing to demand under the guise of kindly feeling a larger sum from him who has not the means to pay off a lesser amount? — On the Duties of the Clergy 3.3.20