Without it you will not be able to read Martin Karrer’s recent RBL review of Peter T. O’Brien’s recent PNTC commentary on the Book of Hebrews. (you’ll have to click to the link to the review on the page). Without it you won’t be able to do much in the way of biblical studies (OT or NT) for that matter.
I need to find a way to start learning it…. (I know this will be disappointing to Dr Dave Black – though I think he would like this commentary as it uses discourse analysis in showing how the book works).
no idea though who he thinks the author is (yet).