For many activities, people cannot rely solely on themselves in evaluating their ability level because such judgments require inferences from probabilistic indicants of talent about which they may have limited knowledge. Self-appraisals are, therefore, partly based on the opinions of others who presumably possess evaluative competence
Albert BanduraMost of the images of reality on which we base our actions are really based on vicarious experience.
Albert BanduraStringent standards of self-evaluation [can] make otherwise objective successes seem to be personal failures
Albert Bandura