As Cotton's theology changed, he began placing less emphasis on preparation ("works") to obtain God's salvation, and more emphasis on the "transforming character of the moment of religious conversion in which mortal man [is] infused with a divine grace." His theology was molded by a number of individuals, besides influences such as Perkins and Sibbes; his basic tenets stemmed from reformer John Calvin. He wrote: "I have read the fathers, and the schoolmen and Calvin too, but I find that he that has Calvin has them all." Other inspirations to his theology include the Apostle Paul and Bishop Cyprian, and reformation leaders Zacharias Ursinus, Theodore Beza, Franciscus Junius (the elder), Jerome Zanchius, Peter Martyr Vermigli, Johannes Piscator, and Martin Bucer. Additional English role models include Paul Baynes, Thomas Cartwright, Laurence Chaderton, Arthur Hildersham, William Ames, William Whitaker, John Jewel, and John Whitgift.
