This side of truth is very present to Whitman; it is this that he means when he tells us that "To glance with an eye confounds the learning of all times." But he is not unready. He is never weary of descanting on the undebatable conviction that is forced upon our minds by the presence of other men, of animals, or of inanimate things. To glance with an eye, were it only at a chair or a park railing, is by far a more persuasive process, and brings us to a far more exact conclusion than to read the works of all the logicians extant. If both, by a large allowance, may be said to end in certainty, the certainty in the one case transcends the other to an incalculable degree. If people see a lion, they run away; if they only apprehend a deduction, they keep wandering around in an experimental humour. Now, how is the poet to convince like nature, and not like books? Is there no actual piece of nature that he can show the man to his face, as he might show him a tree if they were walking together? Yes, there is one: the man's own thoughts. In fact, if the poet is to speak efficaciously, he must say what is already in his hearer's mind. That, alone, the hearer will believe; that, alone, he will be able to apply intelligently to the facts of life. Any conviction, even if it be a whole system or a whole religion, must pass into the condition of commonplace, or postulate, before it becomes fully operative. Strange excursions and high-flying theories may interest, but they cannot rule behaviour. Our faith is not the highest truth that we perceive, but the highest that we have been able to assimilate into the very texture and method of our thinking. It is not, therefore, by flashing before a man's eyes the weapons of dialectic; it is not by induction, deduction, or construction; it is not by forcing him on from one stage of reasoning to another, that the man will be effectually renewed. He cannot be made to believe anything; but he can be made to see that he has always believed it. And this is the practical canon. It is when the reader cries, "Oh, I know!" and is, perhaps, half irritated to see how nearly the author has forestalled his own thoughts, that he is on the way to what is called in theology a Saving Faith.