J. Gerhard's Loci. He is often confused with the hymn-writer, Paul Gerhardt. Remember the "t" in The Lutheran Hymnal and you will do better than some Lutheran teachers.
Bengels Gnomon of the New Testament has had a huge impact on theology, not necessarily for the good. Bengel had the theory that Christ's blood was stored in heaven and used for justification.
Bengel's son-in-law was the first one (I know about) to discover Universal Justification, called General in German, where General means "every single person."
