The most surprising thing about it is this: many a man of able understanding and tenacious memory has become old in the hearing of these doctrines and has told me that after more than thirty years of hearing them expounded, after examining them and testing them in every way, those points which at the beginning seemed most doubtful he now thinks to be the clearest and most selfevident of all, while the matters he then thought most credible are now quite the contrary.