The argument for the existence of the agent intellect in Chapter V perhaps due to its concision has been interpreted in a variety of ways. One standard scholastic interpretation is given in the "Commentary on De anima" begun by Thomas Aquinas when he was regent at the "studium provinciale" at Santa Sabina in Rome, the forerunner of the Pontifical University of Saint Thomas Aquinas, "Angelicum". Aquinas' commentary is based on the new translation of the text from the Greek completed by Aquinas' Dominican associate at Viterbo William of Moerbeke in 1267. The argument, as interpreted by St Thomas Aquinas, runs something like this: in every nature which is sometimes in potency and act, it is necessary to posit an agent or cause within that genus that, just like art in relation to its suffering matter, brings the object into act. But the soul is sometimes in potency and act. Therefore, the soul must have this difference. In other words, since the mind can move from not understanding to understanding and from knowing to thinking, there must be something to cause the mind to go from knowing nothing to knowing something, and from knowing something but not thinking about it to actually thinking about it.