Did you know that the biblical hebrew words for eyelid and wing are from the same root?
Apparently, in the Hebrew mind, the function of a wing isn’t only to fly with, it’s more so to cover with.
Hence Isaiah speaks of God protecting Jerusalem like a hen its chicks (Isaiah 31:5) and of us finding refuge under God’s wings (Psalm 91:4). Speaking of Israel, the Lord says that He “kept him as the apple of His eye.” (Deut 32:10). There is truly no safer place to be that under the shelter of his wings and being covered like the apple of His eye.