cognitive dissonance

Stated simply, cognitive dissonance is what occurs in a person's experience when the message provided does not correspond to the tone or feeling of that message, e.g. telling someone you love them in a menacing tone. An attitude, emotion, belief or value, or even a mixture of these, that contradict each other, supposedly create "a state of opposition between cognitions."

In cognitive consistency theory, the mind is driven by a sort of dialectic to acquire or invent new thoughts or beliefs, or to modify existing beliefs, so as to minimize the amount of dissonance (conflict) between cognitions.

The main criticism of the cognitive consistency hypothesis is that it is impossible to verify or falsify by experiment. Opponents often point to hypocrisy and other examples of people holding totally contradictory beliefs and performing actions contrary to stated beliefs, as evidence that there is no such drive to resolve conflict and achieve cognitive consistency, or even that logical consistency is not in itself an aspect of human psychology.

To refer link en: wikipedia: cognitive dissonance.