Quote from Leo Tolstoy.
Our body is a living-machine. It is organized for that purpose, that is its nature; let the life in it be left to itself; let it defend itself; it will do more than
if you paralyze it by loading it down with remedies. Our body is like a perfect watch which is meant to go a certain time; the watchmaker cannot open it; he can only regulate it by his sense of feeling and with his eyes shut. Our body is a living-machine, that is all it is.
War and Peace by Leo Tolstoy