The Hero of Ages (Mistborn, #3)

by Brandon Sanderson

“It sounds to me, young one,” Haddek said, “that you’re searching for something that cannot be found.” “The truth?” Sazed said. “No,” Haddek replied. “A religion that requires no faith of its believers.”

As a person of faith (Christian) this is really such a powerful line, and probably why I enjoyed Sazed's storyline the most in era 1. Sometimes, at the end of the day, even if your faith can be held reasonably, it cannot be empirically proven because that would then eliminate the faith component.