Irrationality is essential for rationality to exist. Men become rational critical thinkers by learning to identify irrational ideas and coming up with ways of refuting them. The contest between rationality and irrationality is never ending; it will go on for as long as humanity lasts. This contest invigorates our mind and makes us capable of critical thinking, and producing original and fruitful ideas. The civilizations which have been the fountainhead of mankind’s greatest rational ideas have also been the creators of our greatest irrationalities.