That book was my introduction to Lewis. It really opened my eyes to concepts foreign to me at the time but a part of my being today.
I had read Chronicles of Narnia as a child, and Mere Christianity in my late 20’s, but I only discovered this gem about 10 years ago. I had a long drive ahead of me, and I downloaded the recordings for the trip. I had run across it by accident while looking for something else. They’re are now available on YouTube. I was amazed at how timeless it is. Cleese does a fine job of delivery, too.