[29] And a proof of what I have here asserted may be found in the powers which exist in us; for six of those powers, namely the five outward senses and uttered speech, stir up continued and ceaseless war, both by sea and land, some of them doing so from a desire for the objects of the outward senses, which if they cannot obtain they are grieved, and the last by divulging with unbridled mouth numbers of things which ought to be buried in silence.