This isn't so much a book as it is a collection (available from that link as a pdf - free) of sermons, by the great Victorian preacher Charles Spurgeon, on the biblical wisdom book of Proverbs; I've been devotionally reading it one sermon at a time along with my dad for over a year. Rather than working meticulously through the whole book, Spurgeon selects one or two proverbs from each chapter and reflectively spins these out into biblically-rich, theologically-sound and spiritually-edifying sermons. He manages to walk a fine line incredibly well indeed - both developing the inner concepts of the proverbs to demonstrate their wisdom, and extrapolating from them ways that such wisdom can and should lead us deeper into the realities of the gospel. He was very clearly an amazing preacher and thus is in my view deserving of his reputation; erudite in his speech yet accessible to common language and sensibility. The "Victorian-ness" of the prose is a minor gripe but read aloud, as me and my dad did, this evaporates; you are left with Spurgeon in all his intellectual heft weaving points and leading you into Christian exhortation. While I can't definitively say so, I strongly suspect most of his other sermons to be of equal value, and loads of them are online - so check them out. If you're particularly interested in the gospel-centred application of Solomonic wisdom, check this one out specifically.
