The John of Saint Thomas' critique of the suarecian concept of the prime matter The figure of Juan Poinsot is inserted in the movement of return to a Thomism free of nominalist adherences promoted in the Hispanic Thomism by relevant figures of the order of preachers. In this sense must be understood the Poinsot’s critique of some ideas of Scotistic and Ockhamistic origin, present in the metaphysics of Suarez, referred to the ontological status of the material substance, such as: the (...) actuality of matter, the substantial mode of union, the immediate inhesion of the quantity in matter and the idea of entitative extension. (shrink)