A miracle, by definition, transcends the nature of the thing in question. The cause is not attributable to the power of the thing effected or anything in the world.
If God is distinct from what is created, then a miracle cannot be said to be a manifestation of what is created. Pantheism, on the other hand, must deny miracles, because God and the universe are one, and so all apparent miracles are merely unaccounted for manifestations of reality and perhaps explainable by "some future human theory of reality".
Since Jesuits (ostensibly) hold to a Catholic view in which God and the created order are distinct, they must therefore believe that miracles are not only possible, but do happen. The question is then largely whether a particular effect is miraculous or not.
