Simply put, Free Choice... without free choice there is no control over our perceived status...hence, a bland ennui without meaning ensues... Rationalization requires free choice and honest appraisal. Traditional dissonance theory predicts a spreading apart of chosen and rejected alternatives following a decision.
The mind creates your reality. It´s up to you how you choose to view the world.
It is so clear, when you accept that the words "mind", "heaven" and "hell" are representative of human concepts. They have no basis in reality.