Religion then has been an extremely valuable factor for the control of excesses, or at least for their limitation, {183} and thus has been of great significance for health. Religious counsels and prohibitions have not entirely prevented excesses even in those who were adherents of religion, for man is so constituted that it is not quite possible to have all men follow the wiser course. Even the best of men have to confess, like St. Paul, that sometimes, though they know the better path, they follow the worse. If to do good were as easy as it is to know what it is good to do, life would be a much simpler matter. Not knowledge, but will power is needed, and religious practice builds this up and strengthens the will so that it is able to resist many temptations that would otherwise prove difficult to surmount. The contest between good and evil has gone on in spite of religion, and will go on, but there is no doubt at all that evil would have accomplished much more of harm only for the help that religion has been to mankind, and this has been particularly manifest in the limitation of the excesses which so often prove detrimental to health. The old saw of English tradition which in some form or other is many centuries old is well worth recalling in this regard. "Virtue, temperance and repose Slam the door on the doctor's nose." We hear much of the vicious circles that are formed by which things go from worse to worse, one unfavorable factor helping on another, but we forget apparently that there are virtuous circles according to which "all things work together for good." This means good not only for the soul and the mind, but also for the body and for health. Religion makes for health and health promotes religion, and the virtuous circle is completed. {184} CHAPTER X PURITY