[158] [cap.22] Therefore having put an end to empty opinion, on which the chief multitude of men depends, and being devoted to that most sacred possession, truth, let us not use incorrect terms so as to attribute to those who thus call themselves citizens any real share in a free constitution, or any real liberty; nor, on the other hand, let us reproach those who have been born in the house of a master, or who have been bought with money as slaves, but let us rather pass over all ideas of birth, all writings implying mastership, and, in short, everything relating to the body, and let us confine ourselves to investigating the nature of the soul.