You meet a thousand times in life with those who, in dealing with any religious question, make at once their appeal to reason, and insist on forthwith rejecting aught that lies beyond its sphere -- without, however, being able to render any clear account of the nature and proper limits of the knowledge thus derived, or of the relation in which such knowledge stands to the religious needs of men. I would invite you, therefore, to inquire seriously whether such persons are not really bowing down before an idol of the mind, which, while itself of very questionable worth, demands as much implicit faith from its worshipers as divine revelation itself.