Aids to Devotion - CCS - Thoughts on the Holy Spirit from the Epistle to the Ephesians by Andrew Murray and published by Classics.
The author write "SOME years ago I - was asked to write a series of articles under the heading, ‘Aids to Devotion,’ and my mind at the time much occupied with the Epistle to the Ephesians and I thought it might be possible to connect its teaching with the effort to give some help for the “Quiet Hour”, this led to my writing two of the introductory chapters, and the twelve that deal with the chief thoughts of the Epistle.
I am deeply conscious of how defective they are and how little able I have been to satisfy myself in giving expression to what I think I have seen of the treasures that God has stored away in this Epistle for His Church. I have nevertheless ventured on their publication in this little booklet, in the hope that God may use them to help some of His children to realise what the standard of the true Christian life is as it is set before us in the Epistle, and what absolute divine assurance it gives us that God is able and willing to make all that it contains true in our experience. Without that Spirit, specially sought, and received, and yielded to in great teachableness, the truths of the Epistle will remain a hidden mystery."