We know a lot about angels, and that we don't know a lot about angels. There is a great deal of Biblical material, on the one hand; but there are many gaps, holes, and lacunae.
We know that angels are spirit beings of great knowledge, antiquity and power. They can move quickly (Daniel 9:21; Luke 2:13), can appear on earth (Genesis 18:2), or in the throne room of God (Job 1:6). They are spirits (Hebrews 1:7), but can take tangible form and interact with matter (Daniel 10:10). They have consciousness of self and of others (Luke 1:19).
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