"Those who have a natural talent for calculation are generally quick-witted at every other kind of knowledge; and even the dull, if they have had an arithmetical training, although they may derive no other advantage from it, always become much quicker than they would have been."
"I must go beyond the dark world of sense information to the clear brilliance of the sunlight of the outside world. Once done, it becomes my duty to go back to the cave in order to illuminate the minds of those imprisoned in the ‘darkness’ of sensory knowledge."