Somehow Luke understood - in a way that Lando never had, that Hand and Leia and Chewbacca had simply never grasped - just how dark a place the universe really was.
Lando guessed that was where Luke got his humility. His kindness. His gentle faith that people could change for the better. That must have been why he rarely smiled, and almost never made jokes. Because the goodness was all he really had. It was his lifeline. The rope to which he clung, dangling over the abyss.
Matthew Stover