Man's chief difference from the brutes lies in the exuberant excess of his subjective propensities,--his pre-eminence over them simply and solely in the number and in the fantastic and unnecessary character of his wants, physical, moral, aesthetic, and intellectual. Had his whole life not been a quest for the superfluous, he would never have established himself as inexpugnably as he has done in the necessary. And from the consciousness of this he should draw the lesson that his wants are to be trusted; that even {132} when their gratification seems farthest off, the uneasiness they occasion is still the best guide of his life, and will lead him to issues entirely beyond his present powers of reckoning. Prune down his extravagance, sober him, and you undo him. The appetite for immediate consistency at any cost, or what the logicians call the 'law of parsimony,'--which is nothing but the passion for conceiving the universe in the most labor-saving way,--will, if made the exclusive law of the mind, end by blighting the development of the intellect itself quite as much as that of the feelings or the will. The scientific conception of the world as an army of molecules gratifies this appetite after its fashion most exquisitely. But if the religion of exclusive scientificism should ever succeed in suffocating all other appetites out of a nation's mind, and imbuing a whole race with the persuasion that simplicity and consistency demand a _tabula rasa_ to be made of every notion that does not form part of the _soi-disant_ scientific synthesis, that nation, that race, will just as surely go to ruin, and fall a prey to their more richly constituted neighbors, as the beasts of the field, as a whole, have fallen a prey to man.