Gaslighting is a tactic in which a person or entity, in order to gain more power, makes a victim question their reality. It works much better than you may think. Anyone is susceptible to gaslighting, and it is a common technique of abusers, dictators, narcissists, and cult leaders. It is done slowly, so the victim doesn't realize how much they've been brainwashed. For example, in the movie Gaslight (1944), a man manipulates his wife to the point where she thinks she is losing her mind.

11 Warning Signs of Gaslighting:
https://www.psychologytoday.com/us/blog/here-there-and-everywhere/201701/11-warning-signs-gaslighting

Mirrored from https://www.youtube.com/watch?v=KEcj3EmCO1U
Everything Inside Me