 According to Paul, who follows Duns Scotus and Wyclif on this subject, being is univocally shared by everything real, since it is the stuff that the ten categories modulate according to their own essence (In Phys., book I, tr. 1, chap. 2, t. c. 13; In Metaph., book IV, tr. 1, chap. 1, fols. 122ra–125vb, passim; In Porph., chap. De specie, fol. 22rb). In view of this position, Paul maintains no real distinction between essence and being (In Metaph., book IV, tr. 1, chap. 2, fol. 127rb; book VI, chap. 1, fol. 223vb). Like Duns Scotus and Wyclif, Paul speaks of a formal difference (or difference of reason) between essence and being in creatures, as the essence and the essential being of a thing are one and the same entity considered from two distinct points of view, intensionally (the essence) and extensionally (the being) (SN, part VI, chap. 1, fol. 93ra).