It is a well-known law of the connection between ideas that every sensation, of whatever kind, immediately seizes another of its kind, and enlarges itself through this addition. The larger and more manifold it becomes, so much the more does it awaken similar sensations in all directions through the organs of thought, until, by degrees, it becomes universally predominant, and occupies the whole soul. Consequently, every sensation grows through itself; every present condition of the feeling power contains the root of a feeling to follow, similar, but more intense. This is evident. Now, every mental sensation is, as we know, allied to a similar animal one; in other words, each one is connected with more or less movement of the nerves, which take a direction according to the measure of their strength and extension. Thus, as mental sensations grow, must the movements in the nervous system increase also. This is no less clear. Now, pathology teaches us that a nerve never suffers alone: and to say, "Here is a superfluity of strength," is as much as to say, "There is want of strength." Thus, every nervous movement grows through itself. Now, we have remarked that the movements of the nervous system react upon the mind, and strengthen the mental sensations; [Why, how one weeps when one's too weary! Tears, tears! why we weep, 'Tis worth inquiry:--that we've shamed a life, Or lost a love, or missed a world, perhaps? By no means. Simply, that we've walked too far, Or talked too much, or felt the wind in the east, etc. --Aurora Leigh.] vice versa, the strengthened sensation of the mind increase and strengthen the motions of the nerves. Thus we have a circle, in which sensation must always increase, and nervous movements every moment become more powerful and universal. Now, we know that the movements of the bodily frame which cause the feeling of pain run counter to the harmony by which it would exist in well-being; that is, that they are diseased. But disease cannot grow unceasingly, therefore they end in the total destruction of the frame. In relation to pain, it is thus proved that it aims at the death of the subject. But, the motions of the nerves under pleasant sensations being so harmonious to the continuance of the machinery that the condition of mind which constitutes pleasure is that of the greatest bodily well-being, should not rather, then, pleasant sensation prolong the bloom of the body eternally? This inference is too hasty. In a certain stage of moderation, these nervous motions are wholesome, and really a sign of health. But if they outgrow this stage, they may be the highest activity, the highest momentary perfection; but, thus, they are excess of health, no longer health itself.