C.S. Lewis once said that we should read three old books for every new one. I think we should read three C.S. Lewis books for every new one. He never faced the coronavirus, of course, but in the late 1940s, the world was coming to grips with another threat: nuclear annihilation. The bomb was only a few years old, and in the hands of sworn national enemies. The uncertainty of what exactly could happen, not to mention what might happen, was palpable.