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A complex is a constellation of ideas, surrounding an experience with intense emotional charge, which has been suppressed.
It can firstly be noted as the ability of an individual to maintain a balance and consistency in the way he feels in respect of both people and things; secondly, what he does about them. It also gives an index of resilience and stability of a personality which normally matures with age.
Instincts are innate combinations of emotion and behaviour, directed towards goals unrelated to previous experience; which emerge spontaneously driving the lifetime of an individual developing without the need to be learned or acquired from outside.
The given tenet of psycho-dynamic theory is that childhood experiences provide in simplified form a preparation for all the later emotional events of adult life.
Material can be repressed where it is associated with a conflict involving disturbing feelings which reach an intensity sufficiently unbearable to threaten the whole mental and emotional stability of the person experiencing it.
When a complex is activated unpleasant feelings are aroused such as intense hostility and anxiety, overwhelming guilt, extreme fear. But because of the effectiveness of the repression, the actual experience with which they were originally associate, the source, remains oblivious.