“The utilitarian or servile arts enable one to be a servant—of another person, of the state, of a corporation, or of a business—and to earn a living. The liberal arts, in contrast, teach one how to live; they train the faculties and bring them to perfection; they enable a person to rise above his material environment to live an intellectual, a rational, and therefore a free life in gaining truth. Jesus Christ said, “You shall know the truth, and the truth shall make you free” (John 8:32).
Today, as in centuries past, a mastery of the liberal arts is widely recognized as the best preparation for work in professional schools, such as those of medicine, law, engineering, or theology. Those who first perfect their own faculties through liberal education are thereby better prepared to serve others in a professional or other capacity.
The Trivium: The Liberal Arts of Logic, Grammar, and Rhetoric by Sister Miriam Joseph
Read more about the Seven Liberal Arts in this article from the Catholic Encyclopedia here.