Those who are as different from other men as the soul from the body or man from beast are slaves by nature. For them it is better to be ruled in accordance with this sort of rule, if such is the case for the other things mentioned. It is not advantageous for one to be held in slavery who is not a natural slave, for such a condition is sustained solely by force and results in enmity.  Not all slaves are in chains.  Not all slaves even realize that they are slaves.  What is the truth of this world? The Logos are the Words of God.  Time waits for man.