Let the leading and ruling part of your soul stand unmoved by the stirrings of the flesh, whether gentle or rude. Let it not commingle with them, but keep itself apart, and confine these passions to their proper bodily parts; and if they rise into the soul by any sympathy with the body to which it is united, then we must not attempt to resist the sensation, seeing that it is of our nature; but let not the soul, for its part, add thereto the conception that the sensation is good or bad.