I've known about Martyn Lloyd-Jones for years. I knew he was a medical doctor who gave up a promising career to become a pastor. I knew he was stern and a gifted preacher who could take years to work through a book of the Bible. I remember being captivated listening to a cassette tape of him preaching on two words: "But God..." But when I kept hearing Tim Keller mention the influence of Lloyd-Jones on his own ministry, I had to learn more. I'm glad I did.