The Savior likewise confirms this: Do not fear those who can kill the body and can do nothing more. Rather, fear Him who can destroy both body and soul in Gehenna (Mt 10:28).
Solomon bears witness to the same thing: Son, honor the Lord and you will be strong, and fear no other besides Him (Prov 7:1).
In view of this, the Apostle seems to preach something contrary, that slaves should obey masters according to the flesh with fear and trembling, and that a wife should fear her husband.
Here one who answers simply will say that these commandments were established not for perfect slaves, nor for those who have known hidden wisdom, but for those who have only the first beginnings of faith and need humbler teachings, humitioribus doctrinis.
Another may affirm that one who does not have the spirit of bondage again to fear is not subject at all to the sentence that he must obey masters according to the flesh with fear and trembling.
He will say the same also concerning the wife, who is commanded to fear her husband. A third, here as also regarding the wife, will think that the word fear is used in the sense of reverent awe.
Yet he will be constrained by the fact that trembling is here joined to fear. Indeed, reverent fear may be fitting for a wife, that is, that she show reverent awe toward her husband.
But where trembling is present, fear no longer conveys the idea of reverence, but of dread. Thus, with regard to slaves, trembling was necessarily added after the fear of the Lord.
And to distinguish him from the spiritual Master, the master according to the flesh is mentioned here. Thus it is fitting for a slave who believes in God, but has not yet reached the fullness of knowledge, to serve his master according to the flesh with fear and trembling, in simplicity of heart.
He must serve him as faithfully as Christ. He must not serve for appearance, as those do who wish to please men. Rather, he must turn necessity into an object of his own desire, and make a reward for himself from his service.
This is especially so if the master according to the flesh does not command anything different from what is pleasing to the Lord of the spirit. This is precisely what the words mean: serving not only for appearance, to please men, but as slaves of Christ, doing the will of God.
Yet the slave must have this faithfulness not by compulsion, but voluntarily and according to the spirit. He should labor for his master as for Christ, from Whom he has received for faithful service a reward no less than if, as a free man, he served voluntarily.
At the same time, it is necessary to note that the Apostle made different additions to the obedience of slaves and of sons. Concerning children he says: Obey your parents in the Lord.
But to slaves he says: Obey your masters according to the flesh with fear and trembling. Thus, as there is a difference between the fear of a wife and of a slave, so there is also a difference between the obedience of slaves and of children.
When he commands slaves to obey their masters, he adds, as to Christ, and again, as slaves of Christ, doing the will of God. This is so that a slave should not obey a master according to the flesh if that master should wish to command what is contrary to the commandments of God.
According to the conditions of the time, he also prescribed to the Corinthians that there should be no divorce between husband and wife because of faith in Christ, if one of the two wished to believe.
So now also for the Ephesians and Colossians he conditionally establishes less strict rules. Many, having only the beginnings of faith, thought that pagan masters ought to be despised.
He does this lest he appear to stir up even rumor against masters. On the other hand, he teaches that servants must not obey masters if the masters command them to do what is criminal and shameful.