We only call that condition of the natural motions health in which the root of similar ones for the future lies, viz., those which confirm the perfection of succeeding motions; thus, the destiny of continuance is essentially contained in the idea of health. Thus, for example, the body of the most debilitated profligate attains to its greatest harmony at the moment of excess; but it is only momentarily, and a so much deeper abatement shows sufficiently that overstraining was not health. Therefore one may justly accept that an overstrained vigor of physical action hastens death as much as the greatest disorder or the worst illness. Both pain and pleasure draw us towards an unavoidable death, unless something be present which limits their advance. S 26.--Excellence of this Abatement. It is just this (the limit to their growth) which the abatement of the animal nature causes. It must be no other than this limitation of our fragile frame (that appeared to have lent to our opponents so strong a proof against its perfection) which ameliorates all the evil consequences that the mechanism otherwise makes unavoidable. It is exactly this sinking, this lassitude of the organs, over which tinkers complain so much, that prevents our own strength destroying us in a short time; that does not permit our positions to be always increasing towards our destruction. This limitation shows each passion the period of its growth, its height and decline (if indeed the passion does not die out in a total relaxation of the body), which leaves the excited spirits time to resume their harmony, and the organs to recover. Hence, the highest pitch of rapture, of fear, and of anger, are the same as weariness, weakness, or fainting. But sleep vouchsafes more, for as Shakspeare says:-- Sleep, that knits up the ravelled sleeve of care, The death of each day's life, sore labor's bath, Balm of hurt minds, great Nature's sweet restorer. --Macbeth. During sleep, the vital forces restore themselves to that healthy balance which the continuance of our being so much requires; all the cramped ideas and feelings, the overstrained actions which have troubled us through the day, are solved in the entire relaxation of the sensorium; the harmony of the motions of the mind are resumed, and the newly-awakened man greets the coming day more calmly.