A Twitch upon the Thread

Haley asked Kathryn and me to help moderate the Carrots Classic Book Club discussion on the first part of Brideshead Revisited, so of course I agreed!  There is an iconic scene in the story where the main characters are reading a Father Brown mystery aloud, and this is the line the narrator chooses to show us.  Years later, one of the characters remembers the quote and puts it into the context of the entire story, into all our stories:

God's grace is invisible, intangible, and thin, but long and strong enough to stay with us, wherever we may wander.  At any moment, when we least expect it, He may twitch the thread and bring us flying back to Him.