Seneca · On liberal and vocational studies
Letters 88.23
The arts which belong to the education of boys, and are somewhat similar to the liberal arts, are those which the Greeks call the “cycle of studies,” but which we Romans call the “liberal.” However, those alone are really liberal—or rather, to give them a truer name, “free”—whose concern is virtue.
Seneca, Letters to Lucilius 88.23, translated by Richard Mott Gummere