In Gail Godwin’s book “The Finishing School,” which features an older woman and a 14-year-old girl, the woman tells the girl she can tell by looking whether a person has congealed. That person will have no more surprises, the woman tells her young friend, and to avoid the trap she must constantly be on guard against gelling too soon. It’s a valued vignette in one of the Rev. Dr. Lib Caldwell’s favorite books.