" now I want to speak about the word ‘theory’. This was originally an Orphic word, which Cornford interprets as ‘passionate sympathetic contemplation’. In this state, he says, ‘The spectator is identified with the suffering God, dies in his death, and rises again in his new birth.’ for Pythagoras, the ‘passionate sympathetic contemplation’ was intellectual, and issued in mathematical knowledge. In this way, through Pythagoreanism, ‘theory’ gradually acquired its modern meaning; but for all who were inspired by Pythagoras it retained an element of ecstatic revelation. To those who have reluctantly learnt a little mathematics in school this may seem strange; but to those who have experienced the intoxicating delight of sudden understanding that mathematics gives, from time to time, to those who love it, the Pythagorean view will seem completely natural even if untrue. "

― Bertrand Russell , A History of Western Philosophy