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Napier considered mathematics only a hobby, but considered Theology his career.  In 1593 he published a work called "A Plaine Discovery of the Whole Revelation of St. John", in which he claimed he had calculated from the book of Revelations that the end of the world would come in 1688 or 1700 and that Pope Clement VIII was the Antichrist.<ref>http://www.johnnapier.com/john_napier_and_the_devil.htm</ref>

Napier considered mathematics only a hobby, but considered Theology his career.  In 1593 he published a work called "A Plaine Discovery of the Whole Revelation of St. John", in which he claimed he had calculated from the book of Revelations that the end of the world would come in 1688 or 1700 and that Pope Clement VIII was the Antichrist.<ref>http://www.johnnapier.com/john_napier_and_the_devil.htm</ref>