On a Sunday afternoon in 1935, J. Gresham Machen stepped into a broadcast booth at WIP Radio in Philadelphia and began something no one had tried before: teaching Reformed theology over the radio. In the vein of C.S. Lewis’s landmark “Mere Christianity” talks, Machen’s addresses are a crystal-clear articulation of the basics of the Christian faith, unfolding into an exceptional and persuasive explanation of Reformed theology.

Things Unseen is both an accessible systematic theology, and a masterclass in evangelistic apologetics. Introduced by Timothy J. Keller, Foreword by Sinclair B. Ferguson, Historical Preface by Stephen J. Nichols, Afterword by Richard B. Gaffin, Jr. Join us as we sit down with Dr. Nichols and get a glimpse into the life, context, and work of J. Gresham Machen.