as a moderate nominalist, but his admitting of objective precision (praecisio obiectiva) ranks him with moderate realists. The only veritable and real unity in the world of existences is the individual; to assert that the universal exists separately ex parte rei would be to reduce individuals to mere accidents of one indivisible form. Suárez maintains that, though the humanity of Socrates does not differ from that of Plato, yet they do not constitute realiter one and the same humanity; there are as many "formal unities" (in this case, humanities) as there are individuals, and these individuals do not constitute a factual, but only an essential or ideal unity ("In such a way, that many individuals, which are said to be of the same nature, are so: only through the operation of the intellect, not through a substance or essence of things which unites them"). The formal unity, however, is not an arbitrary creation of the mind, but exists "in the nature of the thing, prior [ontologically] to any operation of the intellect". His metaphysical work, giving a remarkable effort of systematisation, is a real history of medieval thought, combining the three schools available at that time: Thomism, Scotism and Nominalism. He is also a deep commentator of Arabic or high medieval works. He enjoyed the reputation of being the greatest metaphysician of his time. He thus founded a school of his own, Suarism or Suarezianism, the chief characteristic principles of which are: the principle of individuation by the proper concrete entity of beings the rejection of pure potentiality of matter the singular as the object of direct intellectual cognition a distinctio rationis ratiocinatae between the essence and the existence of created beings the possibility of spiritual substance only numerically distinct from one another ambition for the hypostatic union as the sin of the fallen angels the Incarnation of the Word, even if Adam had not sinned the solemnity of the vow only in ecclesiastical law the system of Congruism that modifies Molinism by the introduction of subjective circumstances, as well as of place and of time, propitious to the action of efficacious grace, and with predestination ante praevisa merita the possibility of holding one and the same truth by both science and faith the belief in Divine authority contained in an act of faith the production of the body and blood of Christ by transubstantiation as constituting the Eucharistic sacrifice