voracious reader, constantly on the lookout for source material, whether it was from the Anglican minister John Stott, the existentialist philosopher Søren Kierkegaard, or the urbanist thinker Jane Jacobs. “Keller’s originality comes in his synthesis, how he pulls the sources together for unexpected insights,” Hansen writes. “Having one hero would be derivative; having one hundred heroes means you’ve drunk deeply by scouring the world for the purest wells.”
