The Pygmalion Effect explains that
people tend to perform up to the level that others expect of them. This effect explains why our relationships are usually
self-fulfilling prophecies. Once you
set expectations for somebody, that person will tend to
live up to that expectation, whether it's good or bad.
But the Pygmalion Effect also applies to your personal growth. Your beliefs about yourself impact your actions towards others, which influence their beliefs about you and their actions towards you.
Positive
expectations influence performance positively, and negative
expectations influence performance negatively. ... In educational circles, this has been termed the Pygmalion Effect, or more colloquially, a
self-fulfilling prophecy.