And as to keeping to that which is known and leaving the rest--how many affairs of this world are so well-defined, so capable of being clearly understood, as not to leave large spaces of uncertainty, whose very correlate faculty is the imagination? Indeed it must, in most things, work after some fashion, filling the gaps after some possible plan, before action can even begin. In very truth, a wise imagination, which is the presence of the spirit of God, is the best guide that man or woman can have; for it is not the things we see the most clearly that influence us the most powerfully; undefined, yet vivid visions of something beyond, something which eye has not seen nor ear heard, have far more influence than any logical sequences whereby the same things may be demonstrated to the intellect. It is the nature of the thing, not the clearness of its outline, that determines its operation. We live by faith, and not by sight. Put the question to our mathematicians--only be sure the question reaches them--whether they would part with the well-defined perfection of their diagrams, or the dim, strange, possibly half-obliterated characters woven in the web of their being; their science, in short, or their poetry; their certainties, or their hopes; their consciousness of knowledge, or their vague sense of that which cannot be known absolutely: will they hold by their craft or by their inspirations, by their intellects or their imaginations? If they say the former in each alternative, I shall yet doubt whether the objects of the choice are actually before them, and with equal presentation. What can be known must be known severely; but is there, therefore, no faculty for those infinite lands of uncertainty lying all about the sphere hollowed out of the dark by the glimmering lamp of our knowledge? Are they not the natural property of the imagination? there, _for_ it, that it may have room to grow? there, that the man may learn to imagine greatly like God who made him, himself discovering their mysteries, in virtue of his following and worshipping imagination?