These lines present to the reader the hopefulness of the spiritual mind, hopefulness not akin to the merely sanguine temperament, but based on a deep conviction of the reality of the spiritual world, and on unfailing certainty that there is in it a key to the perplexities of this universe of which we men understand so little. We know from experience that material Nature is working out her ends, however little we understand the process, and however unpromising portions of her work might appear without this knowledge. That an acorn should have within it forces which compel earth, air, and water to come to its assistance and become the oak tree, would seem incredible were it not so habitually known as a fact; and the certainty which such experiences give in the material order, the eye of faith gives in the spiritual order. However perplexing the universe now seems to us we have this deep trust that there _is_ an explanation, and that when we are in a position to judge the _whole_, instead of looking on from this corner of time and space, the truth of the spiritual interpretation of its phenomena will be clear--"ut iustificeris in sermonibus tuis et vincas cum iudicaris." This view runs not only through the passages I have just quoted, but through all the poem. The poet pleads for steadfast trust and hope in the face of difficulty, as we would trust a known and intimate friend in the face of ominous suspicions. It is, of course, just that keen realization of the plausibleness of the sceptical view of life, to which some of our modern critics object as a sign of weakness, which gives this poem its strength. Such assistance as Tennyson gives us in seeing and realizing the spiritual view is needed only or mainly by those to whom agnosticism in its various forms is a plausible, and, at first sight, a reasonable attitude. The old-fashioned "irrefragable arguments" are of little use by themselves to persons in such a condition. However evident spiritual truths may be to an absolutely purified reason, they are not evident to intellects which are impregnated with a view of things opposed to the religious view. Moreover, we do not consult a doctor with much confidence if he does not believe in the reality of our illness; and one who finds the sceptical view persuasive will have little trust in those who tell him that it has no plausibility at all. With Tennyson, as with Cardinal Newman, half the secret of his influence in this respect is that the sceptically minded reader finds those very disturbing thoughts which had troubled his own mind anticipated and stated. And yet a truer and deeper view is likewise depicted, which sees beyond these thoughts, which detects through the clouds the light in the heavens beyond.