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To defend ourselves from this threat, and to sustain our peace of mind, we make use of a variety of ego-defence mechanisms, particularly repression, denial, and projection. Not only do we repress the shadow in the personal unconscious, but we deny its existence in ourselves, and project it out on to others. This is done quite unconsciously: we are not aware that we do it. It is an act of ego-preservation which enables us to deny our own ‘badness’ and to attribute it to others, whom we then hold responsible for it. It explains the ubiquitous practice of scapegoating and underlies all kinds of prejudice against people belonging to identifiable groups other than our own. Shadow projection is also involved in the psychiatric symptom of paranoia, when one’s own hostile, persecutory feelings are disowned and projected on to others, who are then experienced as being hostile and persecutory towards oneself.
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Anthony Stevens (Jung: A Very Short Introduction (Very Short Introductions Book 40))