slaves to be subject to their masters, and to serve them heartily and with good-will, so that, if they cannot be freed by their masters, they may themselves make their slavery in some sort free, by serving not in crafty fear, but in faithful love, until all unrighteousness pass away, and all principality and every human power be brought to nothing, and God be all in all. 16. _Of equitable rule._ And therefore, although our righteous fathers[649] had slaves, and administered their domestic affairs so as to distinguish between the condition of slaves and the heirship of sons in regard to the blessings of this life, yet in regard to the worship of God, in whom we hope for eternal blessings, they took an equally loving oversight of all the members of their household. And this is so much in accordance with the natural order, that the head of the household was called _paterfamilias_; and this name has been so generally accepted, that even those whose rule is unrighteous are glad to apply it to themselves. But those who are true fathers of their households desire and endeavour that all the members of their household, equally with their own children, should worship and win God, and should come to that heavenly home in which the duty of ruling men is no longer necessary, because the duty of caring for their everlasting happiness has also ceased; but, until they reach that home, masters ought to feel their position of authority a greater burden than servants their service. And if any member of the family interrupts the domestic peace by disobedience, he is corrected either by word or blow, or some kind of just and legitimate punishment, such as society permits, that he may himself be the better for it, and be readjusted to the family harmony from which he had dislocated himself. For as it is not benevolent to give a man help at the expense of some greater benefit he might receive, so it is not innocent to spare a man at the risk of his falling into graver sin. To be innocent, we must not only do harm to no man, but also restrain him from sin or punish his sin, so that either the man himself who is punished may profit by his experience, or others be warned by his example. Since, then, the house ought to be the beginning or element of the city, and every beginning bears reference to some end of its own kind, and every element to the integrity of the whole of which it is an element, it follows plainly enough that domestic peace has a relation to civic peace,--in other words, that the well-ordered concord of domestic obedience and domestic rule has a relation to the well-ordered concord of civic obedience and civic rule. And therefore it follows, further, that the father of the family ought to frame his domestic rule in accordance with the law of the city, so that the household may be in harmony with the civic order. 17. _What produces peace, and what discord, between the heavenly and earthly cities._