Robert Charles “R.C.” Sproul, the Reformed theologian, pastor, teacher, and lecturer who founded and chaired Ligonier Ministries and authored close to 100 books, including The Holiness of God, died Thursday. He was 78. Sproul was known for delivering uncompromising messages on the holiness and sovereignty of God, in his writing, video teaching series, and as a regular speaker at Ligonier’s national conferences in Orlando, Fla. Ligonier’s mission is “helping Christians know what they believe, why they believe it, how to live it, and how to share it,” he once said. Born in Pittsburgh in 1939, Sproul graduated from Westminster College, which he attended on a football scholarship. A fellow student at Westminster nudged him on his path to discipleship. Sproul told Christianity Today in 2002 that one evening during his freshman year, just as he had finished buying some cigarettes from a dormitory vending...