In western civilization, the period ruled by mysticism is known as the 'Dark Ages' and the 'Middle Ages'. I will assume that you know the nature of that period and the state of human existence in those ages. The Renaissance broke the rules of the mystics. "Renaissance" means the "rebirth". Few people today will care to remind you that it was a rebirth of reason - of man's mind.
Ayn RandWhat is a demanding pleasure that demands the use of ones mind! Not in the sense of problem solving, but in the sense of exercising discrimination, judgment, awareness.
Ayn RandFor centuries, the mystics of spirit had existed by running a protection racket - by making life on earth unbearable, then charging you for consolation and relief, by forbidding all the virtues that make existence possible, then riding on the shoulders of your guilt, by declaring production and joy to be sins, then collecting blackmail from the sinners.
Ayn RandThe man at the top of the intellectual pyramid contributes the most to all those below him, but gets nothing except his material payment, receiving no intellectual bonus from others to add to the value of his time. The man at the bottom who, left to himself, would starve in his hopeless ineptitude, contributes nothing to those above him, but receives the bonus of all of their brains. Such is the nature of the 'competition' between the strong and the weak of the intellect. Such is the pattern of 'exploitation' for which you have damned the strong.
Ayn Rand