I recently preached on the glorious Psalm 139. This devotional was exceptionally helpful. I have the “study resource” volumes as well and can’t recommend this set highly enough. I’ve never seen anything quite like it. Theological, pastoral, devotional, substantive, historical, all in one fantastic set. I will be now consulting the devotional volume, and resource set as my first go-to for any collateral reading on the Psalms. Many thanks for this labor of love!