Thank you for sharing that; very helpful. I have shared your post on Facebook.
I have more forthcoming quotes from the same source. I often hear it said (usually from those who should know better) that exclusive psalmody advocates must not really understand the gospel. But who has written books on the cross as profound as Hugh Martin's The Atonement and The Shadow of Calvary? (Not to mention the books of Fred Leahy and R. A. Finlayson among others.)