"In the High Middle Ages, the moral sensibilities of leading churchmen were different from those in our own time. For example, the canons of the Cathedral of Notre Dame decided to receive a donation towards the construction of the cathedral from the city’s prostitutes, but refused one from the city’s bankers. The women, they argued, had worked for their money. Perhaps this will cost me my reputation as a progressive, but in this instance, I prefer the moral analysis of the High Middle Ages to that of our own time."
From Ross Douthat's Erasmus Lecture by Michael Sean Winters
With thanks to Matthijs who passed this quote on to me.