New Englanders wrote journals, pamphlets, books, and especially sermons—more than all of the other colonies combined. Boston minister Cotton Mather published "Magnalia Christi Americana" (The Great Works of Christ in America, 1702), while revivalist Jonathan Edwards wrote his philosophical work "A Careful and Strict Enquiry Into...Notions of...Freedom of Will..." (1754). Most music had a religious theme, as well, and was mainly the singing of Psalms. Because of New England's deep religious beliefs, artistic works that were insufficiently religious or too "worldly" were banned, especially the theater. The leading theologian and philosopher of the colonial era was Jonathan Edwards of Massachusetts, an interpreter of Calvinism and the leader of the First Great Awakening.