What does Daniel 10:9 mean?

Despite their depiction in popular art, angels are not subtle, man-like creatures. They are incredibly powerful beings (2 Kings 19:35); It's expected that to see one in its "natural" state would inspire a sense of fear (Matthew 28:5; Luke 1:12–13; 2:9–10; Acts 10:3–4). When Daniel sees this figure—probably Gabriel (Daniel 8:15–16; 9:21–22; Luke 1:26)—Daniel's, his face drains of color and he begins to feel weak.

When the being speaks in a roaring voice, however, Daniel seem to pass out. To "fall on one's face" is a sign of either worship or humility. In this case, though, it appears Daniel was simply overwhelmed and fainted. Many biblical descriptions of heavenly encounters include similar reactions (Matthew 17:5–6). If what Daniel sees is a preincarnate Christ, the fear is even more understandable (Revelation 1:13–17). All other encounters will pale in comparison to the second coming of Christ (Revelation 19:11–16), which reduces every enemy into dust (Malachi 4:1).