"Some, " says Dr. Doddridge, "have thought, that not only every region but every man has some particular angel assigned him as a guardian, whose business it is generally to watch over that country or person; for this opinion they urge Matthew 18:10 . Acts 12:15 . But the argument from both these places is evidently precarious; and it seems difficult to reconcile the supposition of such a continued attendance with what is said of the stated residence of these angels in heaven, and with Hebrews 1:14 , where all the angels are represented as ministering to the heirs of salvation: though, as there is great reason to believe the number of heavenly spirits is vastly superior to that of men upon earth, it is not improbable that they may, as it were, relieve each other, and in their turns perform these condescending services to those whom the Lord of Angels has been pleased to redeem with his own blood; but we must confess that our knowledge of the laws and orders of those celestial beings is very limited, and consequently that it is the part of humility to avoid dogmatical determinations on such heads as these."
See ANGEL; and Doddridge's Lectures, lect. 212.