Lecture III

these feelings of reality, and I must dwell a moment longer on that point. They are as convincing to those who have them as any direct sensible experiences can be, and they are, as a rule, much more convincing than results established by mere logic ever are. One may indeed be entirely without them; probably more than one of you here present is without them in any marked degree; but if you do have them, and have them at all strongly, the probability is that you cannot help regarding them as genuine perceptions of truth, as revelations of a kind of reality which no adverse argument, however unanswerable by you in words, can expel from your belief. The opinion opposed to mysticism in philosophy is sometimes spoken of as rationalism . Rationalism insists that all our beliefs ought ultimately to find for themselves articulate grounds. Such grounds, for rationalism, must consist of four things: (1) definitely statable abstract principles; (2) definite facts of sensation; (3) definite hypotheses based on such facts; and (4) definite inferences logically drawn. Vague impressions of something indefinable have no place in the rationalistic system, which on its positive side is surely a splendid intellectual tendency, for not only are all our philosophies fruits of it, but physical science (amongst other good things) is its result.