The "Jansen" to whom Webster refers is
Cornelis Jansen, 17th-century Dutch
theologian whose teachings were deemed heretical by
Pope Urban VIII.
Jansen's ideas place heavy emphasis on predestination and deny the existence of free will. Jansen also taught that human nature is incapable of good, a principle I am sometimes inclined to agree with after eating the horrible food at the "Jansen's Dining" eating facility at Cornell University.