This, therefore, is a law not found in books, but written on the fleshly tablets of the heart, which we have not learned from man, received or read, but which we have caught up from Nature herself, sucked in and imbibed; the knowledge of which we were not taught, but for which we were made; we received it not by education, but by intuition.
Marcus Tullius CiceroAs the scale of the balance must give way to the weight that presses it down, so the mind must of necessity yield to demonstration.
Marcus Tullius Cicero