The one thing which we have to fear, in all this, is of lapsing into indolence and solitary enjoyment, guarding and hoarding our own happiness. We must measure the effectiveness of our enjoyment by one thing and one thing alone--our increase of affection and sympathy, our interest in other minds and lives. If we only end by desiring to be apart from it all, to gnaw the meat we have torn from life in a secret cave of our devising, to gain serenity by indifference, then we must put our desires aside; but if it sends us into the world with hope and energy and interest and above all affection, then we need have no anxiety; we may enter like the pilgrims into comfortable houses of refreshment, where we can look with interest at pictures and spiders and poultry and all the pleasant wonders of the place; we may halt in wayside arbours to taste cordials and confections, and enjoy from the breezy hill-top the pleasant vale of Beulah, with the celestial mountains rising blue and still upon the far horizon. XIX SCIENCE I read the other day a very downright book, with a kind of dry insolence about it, by a man who was concerned with stating what he called the _mechanistic_ theory of the universe. The worlds, it seemed, were like a sandy desert, with a wind that whirled the sands about; and indeed I seemed, as I looked out on the world through the writer's eyes, to see nothing but wind and sand! One of his points was that every thought that passed through the mind was preceded by a change in the particles of the brain; so that philosophy, and religion, and life itself were nothing but a shifting of the sand by the impalpable wind--matter and motion, that was all! Again and again he said, in his dry way, that no theory was of any use that was not supported by facts; and that though there was left a little corner of thought, which was still unexplained, we should soon have some more facts, and the last mystery would be hunted down.