by Nancy Guthrie, Joseph "Skip" Ryan, John Piper, Ligon Duncan, Randy Alcorn, John MacArthur, Francis A. Schaeffer, R. C. Sproul, Joni Eareckson Tada, George Whitefield, Martin Luther, Timothy Keller, Martyn Lloyd-Jones, Jonathan Edwards, Charles H. Spurgeon, Saint Augustine, J. I. Packer, John Calvin, Alistair Begg, Ray Ortlund, J. C. Ryle, James Montgomery Boice, R. Kent Hughes