Page:The wealth of nations, volume 3.djvu/31

 necessarily occasion a gradual declension in the real wealth and revenue of the society; a declension of which the progress must be quicker or slower, according to the degree of this encroachment, according as that natural distribution, which the most perfect liberty would establish, is more or less violated. Those subsequent formularies represent the different degrees of declension, which, according to this system, correspond to the different degrees in which this natural distribution of things is violated.

Some speculative physicians seem to have imagined that the health of the human body could be preserved only by a certain precise regimen of diet and exercise, of which every, the smallest, violation necessarily occasioned some degree of disease or disorder proportioned to the degree of the violation. Experience, however, would seem to show, that the human body frequently preserves, to all appearance at least, the most perfect state of health under a vast variety of different regimens; even under some which are generally believed to be very far from being perfectly wholesome. But the healthful state of the human body, it would seem, contains in itself some unknown principle of preservation, capable either of preventing or of correcting, in many respects, the bad effects even of a very faulty regimen. Mr. Quesnay, who was himself a physician, and a very speculative physician, seems to have entertained a notion of the same kind concerning the political body, and to have imagined that it would thrive and prosper only under a certain precise regimen, the exact regimen of perfect liberty and perfect justice. He seems not to have considered that in the political body, the natural effort which every man is continually making to better his own condition, is a principle of preservation capable of preventing