Is God involved in our lives? Paul is bringing the example of Christ, and His attitude toward those who were in authority, all the way down to an employment level. In Ephesians 5:21, he brought it down to a relationship within a congregation. But in both cases, the submitting was done out of respect for God—not because the authority was great, not because the person was a better man or woman—in fact, it had nothing whatever to do with the character of the person in authority.
Our submission has everything to do with our relationship to God, what we know of Him, and the purpose He is working out. The biblical definition of submission is clear. This instruction is in perfect harmony with Romans 12 where he says, "Live with all men in peace," as well as, "Vengeance is mine, I will repay!"
Submission is an act of faith. It has nothing at all to do with the quality of character of the person to whom we are submitting. It does not matter whether he is a good or a bad guy. It does not matter whether or not we feel what he is doing is unjust. It may be very unjust—as the taking of Christ's life was very unjust. But Christ submitted to whatever God permitted—out of fear, out of respect, out of faith that God had Him in His hands and nothing would happen before its time. He knew God was concerned about the outcome of His life.
So then, biblical submission is respecting divinely appointed authority out of respect for Christ.