Even the best of men can be deceived by their true nature.
One’s eyes can be deceived. We see what we believe, not the other way around.
You truly are the Great Deceiver. You can deceive even yourself.[to Sauron]
It is said that once the Deceiver obtains a being’s trust, he gains the ability to sculpt their very thoughts. To deceive not only their heart and mind, but their eyes and ears. To alter their very reality.