A noble doubt suggests itself whether discipline be not the final cause of the universe, and whether Nature outwardly exists. The frivolous make themselves merry with the ideal theory as if its consequences were burlesque, as if it affected the stability of Nature. It surely does not. The wheels and springs of man are all set to the hypothesis of the permanence of Nature. But while we acquiesce entirely in the permanence of natural laws, the question of the absolute existence of Nature still remains open. It is the uniform effect of culture on the human mind to lead us to regard Nature as a phenomenon, not a substance; to attribute necessary existence to spirit. Intellectual science fastens the attention upon immortal necessary uncreated natures, that is, upon ideas; and in their presence we feel that the outward circumstance is a dream and a shade. Whilst we wait in this Olympus of the gods we think of Nature as an appendix to the soul. Finally, religion and ethics, which may be fitly called the practice of ideas, have an analogous effect. The first and last lesson of religion is: "The things that are seen are temporal; the things that are unseen are eternal." _VII.--THE SPIRIT BEHIND NATURE_ The aspect of Nature is devout. Like the figure of Jesus, she stands with bended head and hands folded on the breast. The happiest man is he who learns from Nature the lesson of worship. Of that ineffable essence we call spirit, he that thinks most will say least. We can foresee God in the coarse, as it were, distant phenomena of matter; but when we try to define and describe Himself, both language and thought desert us, and we are as helpless as fools and savages. The noblest ministry of Nature is to stand as the apparition of God. It is the organ through which the universal spirit speaks to the individual, and strives to bring back the individual to it. I conclude this essay with some traditions of man and Nature which a certain poet sang to me. The foundations of man are not in matter, but in spirit. And the element of spirit is eternity. To it, therefore, the longest series of events, the oldest chronologies are young and recent. A man is a god in ruins. When men are innocent, life shall be longer and shall pass into the immortal as gently as we awake from dreams. Infancy is the perpetual Messiah which comes into the arms of fallen men, and pleads with them to return to paradise. The problem of restoring to the world the original and eternal beauty is solved by the redemption of the soul. The ruin that we see when we look at Nature is in our own eye. Man cannot be a naturalist until he satisfies all the demands of the spirit. Love is as much its demand as perception. When a faithful thinker shall kindle science with the fire of the holiest affection, then will God go forth anew into the creation.