Read an article about this book and found a great quote from C. S. Lewis's stepson, Douglas Gresham, the author of this particular biography:
I am sometimes asked what it is like living in the shadow of such a great man, and I always point out that Jack did not leave a shadow behind him but a glow. If I am able to reflect even the slightest spark of that glow, I am more than happy to do so.
What a wonderful tribute! What a wonderful legacy to leave!
Reminds me of my life word: illuminate