A self-fulfilling prophecy is ...

A self-fulfilling prophecy is an assumption or prediction that, purely as a result of having been made, cause the expected or predicted event to occur and thus confirms its own 'accuracy.'
 Paul Watzlawick

Quotes from the same author

Maturity is doing what you think is best, even when your mother thinks it's a good idea.
 Paul Watzlawick
Maturity… is the ability to do something even though your parents have recommended it.
 Paul Watzlawick
It obviously makes a difference whether we consider ourselves as pawns in a game whose rules we call reality or as players of the game who know that the rules are ‘real’ only to the extent that we have created or accepted them, and that we can change them.
 Paul Watzlawick
Frank Farrelly. . .must be thought of with respect (perhaps even delight?) by his clients who have so far played the game of therapy with their therapists, but, I am afraid, also a shocking example for those therapists who, in Laing's words, 'are playing at not playing a game'.
 Paul Watzlawick
This is the secret of propaganda: To totally saturate the person, whom the propaganda wants to lay hold of, with the ideas of the propaganda, without him even noticing that he is being saturated.
 Paul Watzlawick