C.S. Lewis was an exemplary communicator of Christian truth. So was the 18th-century theologian Jonathan Edwards.

The use of images was Edwards’s forte, while Lewis excelled in illustrations. Both men understood that abstract, propositional truth touches the heart when it’s taken into the realm of the concrete. And it’s precisely this practice that Tim Keller and John Piper commend to the writers and thinkers within the New Calvinism movement.

In this five-minute video, the final segment of a four-part conversation, Keller explains the difference between illustrations and images and recommends four books to start with if you’re new to C.S. Lewis.

More from Keller and Piper on Lewis:

• Part 1: Keller and Piper Talk C.S. Lewis (ten-minute video)

• Part 2: When (Seemingly) Opposites Meet: Keller and Piper on Lewis (five-minute video)

• Part 3: Would We Have Been Friends? Keller and Piper on Lewis (five-minute video)