Knuth is a unique character. I read the more personal of his books last year, "Things a Computer Scientist Rarely Talks About". It's essentially a transcript of several open lectures he gave at Stanford on topics ranging from his hobbies and side-projects to his thoughts on the Bible and his Christian faith. I've been a staunch atheist for the majority of my life, but seeing Knuth talk so comfortably about his spirituality actually helped me appreciate religion more.