38 As also in the night, while He was praying, it is written— There appeared to Him an angel strengthening Him. But here all mouths, celestial and terrestrial, are insufficient to give thanks to Him by Whose hand the angels were created; that He was strengthened for the sake of sinners by that angel who was created by His hand. As then the angel from above stood in glory and in brightness, while the Lord of the angel, that He might exalt man who was degraded, stood in degradation and humility; so also here that light flashed forth in manifestation; but the Lord of the light, for the sake of helping one persecutor, spoke with humble voice and lowly words.
Source: On Our Lord (New Advent)