The Angels of God by Arno C Gaebelein and published by Classics.
Who can tell of the other suns and their planets and their possible inhabitants? Science can only guess, but we can turn to the revelation of God, the Bible. Does the Word of God answer our question about other beings in this immense space, which we call the heavens, who know God as Creator, who know His works and who serve Him? And if there are such beings in existence, who are they, where are they and what are they doing?
The Bible is not silent on these questions. God’s Holy Word gives us an answer. There is another class of beings above man. These beings are the Angels of God, the heavenly hosts, the tenants of the heavens, the innumerable company of the unseen servants of God. Arno C. Gaebelein, one of the great theologians of the 20th century, tells us, “Like every truth, the truth of the angels of God – their presence on earth and their loving ministries – has practical value. As we realize in faith... that they are watching us, ready to walk with us as we walk with Him in His ways, ready to serve us as we serve Him, ready to shield us and help us in a hundred different ways, a solemn feeling will come into our lives. Thus this truth will assist us in a holy life.”