The most aggressive opposition to the Jesuits came from a movement called Jansenism. Cornelius Jansen (1585–1638) was a Dutchman who had adopted St. Augustine’s views of sin and grace at the University of Louvain. He came to believe that the best way to defend Catholicism against the Calvinist challenge was to return to the doctrines of the great North African and establish a rigorous moral code for the Catholic clergy to combat the easygoing ethics of the Jesuits. Jansen carried on his campaign against the Jesuits as professor of Scripture at Louvain and later as Bishop of Ypres. At his death
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