Cardinal de Lugo also should be included in this catalogue; indeed he is one of the most eminent theologians of modern times. His precocity as a child was almost preternatural, he was reading books when he was three years old and was tonsured at ten; at fourteen, he defended a public thesis in philosophy, and about the same time he was appointed to an ecclesiastical benefice by Philip II. He studied law at the University of Salamanca, but soon followed his brother into the Society. After teaching philosophy at Medina del Campo and theology at Valladolid, he was summoned to Rome to be professor of theology. His lectures were circulated all over Europe before they were printed, and only when ordered by superiors did he put them in book form. Between 1633 and 1640 he published four volumes which cover the whole field of dogmatic theology. Their characteristic is that there is little, if any, repetition of what other writers had already said. St. Alphonsus Liguori rated him as only just below St. Thomas Aquinas; and Benedict XIV styles him "a light of the Church." He was made a cardinal in 1643. The distinguished Father Lehmkuhl appropriates four long columns in "The Catholic Encyclopedia" to express his admiration for Gregory de Valencia who was born in 1541 and died in 1603. He came from Medina in Spain and was studying philosophy and jurisprudence in Salamanca, when attracted by the preaching of Father Ramírez, he entered the novitiate and had the privilege of being trained by Baltasar Álvarez, who was one of the spiritual directors of St. Teresa. St. Francis Borgia called him to Rome, where he taught philosophy with such distinction that all North Germany and Poland petitioned for his appointment to their universities. He was assigned to Dillingen, and two years afterwards to Ingolstadt, where he taught for twenty-four years. His "Commentary" in four volumes on the "Summa theologica" of St. Thomas is one of the first comprehensive theological works of the Society. He contributed about eight polemical treatises to the war on Lutheranism, which was then at white heat; but he was not at one with his friend von Spee in the matter of witchcraft. Von Spee wanted both courts and trials abolished; Gregory thought their severity might be tempered. He had much to do with the change of view in moral theology on the subject of usury; and the two last volumes of his great work, the "Analysis fidei catholicæ" culminates in a proof of papal infallibility which expresses almost literally the definition of the Vatican Council.