I recently purchased Ramage's Scripture Parallels in Ancient Classics. It's a nice resource but I have to remember that it's in my library for it to be useful. It would be nice if the Passage Guide had a section for backgrounds that included this resource and others, so that if I do a Passage Guide on Luke 4:23, for example, it would point me to the parallels given in Ramage's work (Plutarch, De Discern. Adulator. et Amici, c. 32 or p. 71 F; Sen., Ep., 50, 4; Plutarch, Demosth., C. 3).