I never met Tim Keller, but his sermons, books, articles, and life’s work have greatly shaped the way I do ministry. I recommend his many books.
The gospel is that I am so sinful that Jesus had to die for me, yet so loved and valued that Jesus was glad to die for me. This leads to deep humility and deep confidence at the same time. I can’t feel superior to anyone, and yet I have nothing to prove to anyone.