. Under Francisco de Vitoria, the University of Salamanca led a period of intense activity in theology, especially a renaissance of Thomism, whose influence extended to European culture in general, but especially to other European universities. Perhaps the fundamental contribution of the School of Salamanca to theology is the study of problems much closer to humanity, which had previously been ignored, and the opening of questions that had previously not been posed. The term positive theology is sometimes used to distinguish this new, more practical, theology from the earlier scholastic theology. Morality In an era when religion permeated everything, to analyze the morality of the acts was considered the most practical and useful study one could undertake to serve society. The novel contributions of the School in law and economics were rooted in concrete challenges and moral problems which confronted society under new conditions. Over the years a casuistry, a fixed set of answers to moral dilemmas, had been developed. However, by its nature, a casuistry can never be complete, leading to a search for more general rules or principles. From this developed probabilism, where the ultimate criterion was not truth, but the certainty of not choosing evil. Developed principally by Bartolomé de Medina and continued by Gabriel Vázquez and Francisco Suárez, Probabilism became the most important school of moral thought in the coming centuries. The De auxiliis controversy The De auxiliis controversy was a dispute between Jesuits and Dominicans which occurred at the end of the 16th century. The topic of the controversy was grace and predestination, that is to say how one could reconcile the liberty or free will of humans with divine omniscience. In 1582 the Jesuit Prudencio Montemayor and Fray Luis de León spoke publicly about human liberty. Domingo Báñez considered that they gave free will too great a weight and that they used terminology that sounded heretical; he denounced them to the Spanish Inquisition, accusing them of Pelagianism, a belief in human free will to the detriment of the doctrine of original sin and the grace granted by God. Montemayor and de León were banned from teaching and prohibited from defending such ideas. Báñez was then denounced to the Holy Office by Leon, who accused him of "committing the error of Lutheranism", that is of following the doctrines of Martin Luther. According to Lutheran doctrine, man is "dead in his trespasses" (Ephesians 2:1) as a