by Nancy Guthrie, John Piper, Timothy Keller, Jonathan Edwards, John Owen, Stephen F. Olford, Joseph "Skip" Ryan, Martin Luther, Adrian Rogers, Philip Graham Ryken, Martyn Lloyd-Jones, Ligon Duncan, C. J. Mahaney, Charles H. Spurgeon, Saint Augustine, J. I. Packer, John Calvin, Alistair Begg, John MacArthur, Ray Ortlund, Francis A. Schaeffer, J. C. Ryle, James Montgomery Boice, R. C. Sproul, R. Kent Hughes, Joni Eareckson Tada