Mind Hacking
Well, what our feathered friend was uttering essentially was, “You, celestial being, have been created to be an angel of the Lord.” You've got into his operating system – his factory settings.
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History
The minds of angels can be infiltrated by performing a lobotomy on their brain. It appears that their memories can be accessed, manipulated, and stolen with this procedure. Angels like Naomi can control and hack into the angel's mind with a drill while demons like Crowley and Viggo use a headgear torture device to plant spikes into the angel's head and force them to relay information in Enochian. Despite being able to infiltrate the minds of celestial beings, these instruments appear to be incapable of killing angels. Archangels like Michael can also invade the minds of others and even relay information in English without utilizing this equipment, even other archangels like Lucifer. Jack Kline is also shown to do the same thing without even touching Lucifer.