This is a good translation of an important text by Aquinas. It's part of his commentary on Boethius' De Trinitate. He covers the sciences and the liberal arts. He discusses the divisions of science-practical vs. speculative, divine vs. mathematical vs. physical-methods of the sciences, and the relation of theology to the other sciences. It makes for mostly interesting, but somewhat dry reading (this is probably true of all texts by St. Thomas). There's much to be gained here if you like medieval philosophy/theology/science or if you just enjoy dipping into Scholastic texts once in a while (and you should!). If you're interested in the Liberal Arts tradition, this is an important text. You'll find him commenting not only on Boethius but on Hugh of St. Victor. There's also a nice introduction which will help illuminate some of the dark corners of the text.