9. _The desire of happiness, ample and complete, beyond what this world can afford, is not planted in man by defect of his nature, but by the perfection of his nature, and in view of his further perfection_. This desire has not the character of a drawback, a thing that cannot be helped, a weakness and decay of nature, and loss of power, like that which sets in with advancing years. A locomotive drawing a train warms the air about it: it is a pity that it should do so, for that radiation of heat is a loss of power: but it cannot be helped, as locomotives are and must be constructed. Not such is the desire of perfect happiness in the human breast. It is not a disease, for it is no peculiarity of individuals, but a property of the race. It is not a decay, for it grows with the growing mind, being feeblest in childhood, when desires are simplest and most easily satisfied, and strongest where mental life is the most vigorous. It is an attribute of great minds in proportion to their greatness. To be without it, would be to live a minor in point of intellect, not much removed from imbecility. It is not a waste of energy, rather it furnishes the motive-power to all human volition. It comes of the natural working of the understanding that discerns good, and other good above that, and so still higher and higher good without limit; and of the natural working of the will, following up and fastening upon what the understanding discerns as good. The desire in question, then, is by no means a necessary evil, or natural flaw, in the human constitution. 10. It follows that the desire of perfect happiness is in man by the normal growth of his nature, and for the better. But it would be a vain desire, and objectless, if it were essentially incapable of satisfaction: and man would be a made and abiding piece of imperfection, if there were no good accessible to his intellectual nature sufficient to meet its proper exigence of perfect happiness. But no such perfect happiness is attainable in this world. Therefore there must be a world to come, in which he who was man, now a disembodied spirit, but still the same person, shall under due conditions find a perfect good, the adequate object of his natural desire. Else is the deepest craving of human nature in vain, and man himself is vanity of vanities.