I never read The Wisdom of Insecurity, and it's been years, but I read The Book, The Way of Liberation, and The Joyous Cosmology and enjoyed every one of them when my mind was open enough. I'm tempted to put his books on my BabyJesus list. I hadn't thought of him in a long time until I saw the video in the OP linked on an art subreddit. Brought some nostalgia.