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cause he cannot hold onto a view of himself (in this case, a picture of a worthwhile person accepted by others) which inconsistent with the attitudes surrounding him. Eventually, he comes to realize that the others' view the correct one. T]hereafter, he also views himself as unfavorable. Yet, this attitude has now become consistent, and he holds onto it tenaciously. This changed self-attitude apt to be manifested through his self-images. Therefore, once you surround an individual with certain expectations, he begins to live up to those same expectations (such as, when the individual constantly treated as though he were less worthy or less important than others). As they believe he is, he comes to believe he is (Jourard, 1958).
Soares et al. (Wed,) studied this question.