Mephistopheles

Good! the method is revealed Without or gold or magic or physician. Betake thyself to yonder field, There hoe and dig, as thy condition; Restrain thyself, thy sense and will Within a narrow sphere to flourish; With unmixed food thy body nourish; Live with the ox as ox, and think it not a theft That thou manur’st the acre which thou reapest;— That, trust me, is the best mode left, Whereby for eighty years thy youth thou keepest!