"Faith in not rational. Do you know what a cathedral is, Chief Engineer?"

"A kind of church," she said. "A big church."

"A church that took centuries to build," he clarified. "And could cost hundreds of lives in the building. A church that represented an absolutely absurd investment for a medieval lord. And yet they got built anyway. For the glory of God."
Chill - Elizabeth Bear

Grail, p. 292, by Elizabeth Bear