It is no exaggeration to say that every human being is hypnotized to some extent either by ideas he has uncritically accepted from others or ideas he has repeated to himself or convinced himself are true. These negative ideas have exactly the same effect upon our behavior as the negative ideas implanted into the mind of a hypnotized subject by a professional hypnotist.

Psycho-Cybernetics A New Technique for Using Your Subconscious Power (ed. 1960)