William Paley was an English theologian and moral philosopher. His father, William, was vicar of Helpston, Northamptonshire, and a minor canon of Peterborough; he later became headmaster of Giggleswick grammar school, where the younger Paley was educated. Paley entered Christ's College, Cambridge, in 1759, where he studied mathematics and became a senior wrangler. After an interlude of school teaching, he was elected a fellow of his college in 1766 and was ordained a priest in the established church in 1767. He taught at Cambridge for nine years, leaving the university only on his marriage. He held successively a number of different offices in the church, rising to be the archdeacon of Carlisle. Paley was the author of three books, one on morals and two defending Christian belief, all of which were widely read and accepted as textbooks. As late as 1831, Charles Darwin, studying for his BA examination...