To the very title of this paper, or at any rate to the idea implied in it, the average religious thinker might conceivably make more objections than one. He might in the first place inquire whether any meaning can be found in the term “rational mysticism”; and, examining it either from the standpoint of reason or from that of mysticism, might complain that it attempts to bring together two quite incompatible things. Reason has usually held mysticism in scorn, looking upon it as a sort of quack method, if the word may pass, of accomplishing, or of pretending to accomplish, what reason accomplishes in the professional and only legitimate way. Mysticism, from the other side, has been ready enough to repay scorn with scorn: it has claimed to find its way to the secret places of truth by a subtle process far more efficacious than that laborious following of the trail which reason practises; and its independence of reason, its irreconcilability with reason, it has always taken as its glory rather than its shame. What—the average religious man might say—what can “rational mysticism” mean? How, indeed, can such a thing exist at all? And in the next place, even supposing you could manufacture the curious compound that “rational mysticism” would be, and could link the two seeming incompatibles together, how are you going to make any connection between your newly created rational mysticism and New Testament Christianity? Rational, indeed, New Testament Christianity is, or claims to be; and to show its harmony with reason (provided that the thing be not pushed too far) is one of the chief objects that Christian apologetics may well keep in view.