What is Liberal Education?

According to the Renaissance humanist Petrus Paulus Vergerius:

We call those studies liberal which are worthy of a free man; those studies by which we attain and practise virtue and wisdom; that education which calls forth, trains and develops those highest gifts of body and of mind which ennoble men, and which are rightly judged to rank next in dignity to virtue only. For to a vulgar temper gain and pleasure are the one aim of existence, to a lofty nature, moral worth and fame. It is, then, of the highest importance that even from infancy this aim, this effort, should constantly be kept alive in growing minds. For I may affirm with fullest conviction that we shall not have attained wisdom in our later years unless in our earliest we have sincerely entered on its search.