Didascalicon, Book III: the art of study (discipline and method)
Chapter XIX. On frugality
They also wish frugality to be urged upon readers, that is, not to pursue superfluous things, which especially looks to discipline. For a fat belly, as is said, does not beget a keen mind. But what can the scholars of our time answer to this, who not only disdain to follow frugality in their studies but even strive to seem richer than they are. Nor does anyone now boast of what he has learned, but of what he has spent. But perhaps they wish to imitate their masters, of whom I find nothing worthy to say.