There is another layer to this story. The act of purification accompanying the creation of the modern research university was not just about differentiating realms of knowledge. It was also about divorcing knowledge from virtue. Though it seems foreign to us now, before purification the philosopher (and natural philosopher) was assumed to be morally superior to other sorts of people.
The 18th-century thinker Joseph Priestley wrote “a Philosopher ought to be something greater and better than another man.” Philosophy, understood as the love of wisdom, was seen as a vocation, like the priesthood. It required significant moral virtues (foremost among these were integrity and selflessness), and the pursuit of wisdom in turn further inculcated those virtues.