"The Left Hand Of God" by William E. Barrett; he also wrote "Lilies Of The Field". I find him restful to read. As opposed to some who put my teeth on edge! Purely personal taste of course. Oh, the first book is early 1950s and the second was a movie in the early 60s with Sidney Poitier.
Science Fiction: "The Shrinking Man" by Richard E. Matheson. Very moving.