Jefferson, while primarily a planter, lawyer and politician, mastered many disciplines, which ranged from surveying and mathematics to horticulture and mechanics. He was an architect in the classical tradition. Jefferson's keen interest in religion and philosophy led to his presidency of the American Philosophical Society; he shunned organized religion but was influenced by Christianity, Epicureanism, and deism. A philologist, Jefferson knew several languages. He was a prolific letter writer and corresponded with many prominent people. Among his books is "Notes on the State of Virginia" (1785), considered perhaps the most important American book published before 1800. Jefferson championed the ideals, values, and teachings of the Enlightenment.