Reply to Objection 2: Simply speaking it is necessary that the master and the servant should be distinct; yet a certain notion of mastership and subservience may be preserved inasmuch as the same one is master of Himself in different respects.
Reply to Objection 3: On account of the divers parts of man, one of which is superior and the other inferior, the Philosopher says (Ethic. v, 11) that there is justice between a man and himself inasmuch as the irascible and concupiscible powers obey reason. Hence this way a man may be said to be subject and subservient to Himself as regards His different parts.
To the other arguments, the reply is clear from what has been said. For Augustine asserts that the Son is less than, or subject to, Himself in His human nature, and not by a diversity of supposita.