Imagination—It is that deceitful part in man, that mistress of error and falsity, the more deceptive that she is not always so; for she would be an infallible rule of truth, if she were an infallible rule of falsehood. But being most generally false, she gives no sign of her nature, impressing the same character on the true and the false.
I do not speak of fools, I speak of the wisest men; and it is among them that the imagination has the great gift of persuasion. Reason protests in vain; it cannot set a true value on things.
This arrogant power, the enemy of reason, who likes to rule and dominate it, has established in man a second nature to show how all-powerful she is. She makes men happy and sad, healthy and sick, rich and poor; she compels reason to believe, doubt, and deny; she blunts the senses, or quickens them; she has her fools and sages; and nothing vexes us more than to see that she fills her devotees with a satisfaction far more full and entire than does reason. Those who have a lively imagination are a great deal more pleased with themselves than the wise can reasonably be. They look down upon men with haughtiness; they argue with boldness and confidence, others with fear and diffidence; and this gaiety of countenance often gives them the advantage in the opinion of the hearers, such favour have the imaginary wise in the eyes of judges of like nature. Imagination cannot make fools wise; but she can make them happy, to the envy of reason which can only make its friends miserable; the one covers them with glory, the other with shame.
— Blaise Pascal, from Pensées, Section II, 82