By the name of “angel,” is signified generally, a “messenger”; and most often a “messenger of God”; and by a messenger of God is signified, anything that makes known His extraordinary presence; that is to say, the extraordinary manifestation of His power, especially by a dream or vision.
Concerning the creation of “angels,” there is nothing delivered in the Scriptures. That they are spirits, is often repeated: but by the name of spirit, is signified both in Scripture and vulgarly, both amongst Jews and Gentiles, sometimes thin bodies: as the air, the wind, the spirits vital and animal of living creatures; and sometimes the images that rise in the fancy in dreams and visions; which are not real substances, nor last any longer than the dream or vision they appear in; which apparitions, though no real substances, but accidents of the brain; yet when God raiseth them supernaturally, to signify His will, they are not improperly termed God’s messengers, that is to say, His “angels.”