[23] This man, dwelling in the soul of each individual, is found at one time to be a ruler and monarch, and at another time to be a judge and umpire of the contests which take place in life. At times also he takes the place of a witness and accuser, and without being seen he corrects us from within, not suffering us to open our mouths, but taking up, and restraining, and bridling, with the reins of conscience the self-satisfied and restive course of the tongue.