Wesley Corpus

5. God has indeed provided for the execution of his own decree in the very principles of our nature. It is well known, the human body, when it comes into the world, consists of innumerable membranes exquisitely thin, that are filled with circulating fluid, to which the solid parts bear a very small proportion. Into the tubes composed of these membranes, nourishment must be continually infused; otherwise life cannot continue, but will come to an end almost as soon as it is begun. And suppose this nourishment to be liquid, which, as it flows through those fine canals, continually enlarges them in all their dimensions; yet it contains innumerable solid particles, which continually adhere to the inner surface of the vessels through which they flow; so that in the same proportion as any vessel is enlarged, it is stiffened also. Thus the body grows firmer as it grows larger, from infancy to manhood. In twenty, five-and-twenty, or thirty years, it attains its full measure of firmness. Every part of the body is then stiffened to its full degree; as much earth adhering to all the vessels, as gives the solidity they severally need to the nerves, arteries, veins, muscles, in order to exercise their functions in the most perfect manner. For twenty, or, it may be, thirty years following, although more and more particles of earth continually adhere to the inner surface of every vessel in the body, yet the stiffness caused thereby is hardly observable, and occasions little inconvenience. But after sixty years (more or less, according to the natural constitution, and a thousand accidental circumstances) the change is easily perceived, even at the surface of the body. Wrinkles show the proportion of the fluids to be lessened, as does also the dryness of the skin, through a diminution of the blood and juices, which before moistened and kept it smooth and soft. The extremities of the body grow cold, not only as they are remote from the centre of motion, but as the smaller vessels are filled up, and can no longer admit the circulating fluid. As age increases, fewer and fewer of the vessels are pervious, and capable of transmitting the vital stream; except the larger ones, most of which are lodged within the trunk of the body.