Well. I finished the book but I need to think about it for a bit before I write about it. The title comes from "The Battle Hymn of the Republic," 1862, by Julia Ward Howe. Here are the first two lines, "Mine eyes have seen the glory of the coming of the Lord, he is trampling out the vintage where the grapes of wrath are stored." If you'd like to listen to a stirring version of the song, here is the Mormon Tabernacle Choir performing at West Point (it's quite goosebumpy, y'all).