"It is true that doubt (or rather uncertainty) on some questions is a bar to spiritual progress, but the antidote to that doubt is not blind faith (which is itself considered a fetter, as will presently be seen), but the certainty of conviction founded on individual experiment or mathematical reasoning. While a child doubts the accuracy of the multiplication table, he can hardly acquire proficiency in the higher mathematics; but his doubts can be satisfactorily cleared up only by his attaining a comprehension, founded on reasoning or experiment, that the statements contained in the table are true. He believes that twice two are four, not merely because he has been told so, but because it has become to him a self-evident fact. And this is exactly the method, and the only method, of resolving doubt known to Occultism. p. 194"