Again Paul returns to the issue that ultimately the one who is served is the Lord. Such submission can in this case only be shown out of faith, for the Christian sees that behind his earthly master is another greater master to whom he is offering service.
Service for the Christian slave and for the Christian employee is not just about the product of their service so that they give a benefit to those they serve. It is also about their minds, and it starts with a good attitude in the heart. For the slave, this is part of his sanctification so that he cannot grow in holiness and walk with the Lord unless he learns to serve in an acceptable way. It should not be hard for a Christian to take the place of a servant even when the one being served is not worthy of such service, for their Lord has served them and laid down his life for his enemies. Nevertheless, pride and haughtiness, an undue sense of self-importance will hinder that proper attitude with which true service begins. They will produce a grudging obedience which lacks any cheerfulness and willingness. It is not enough for the slave to carry out his duties correctly while all the time he harbours resentment towards his master. Slavery and employment are opportunities in which to learn meekness and submission and the lesson is all the more powerful in that submission is to be shown to those who do not really deserve it. No Christian in any situation will ever lose anything in the world to come by doing the will of God. By accepting his position of slavery in this life, the slave is not conceding that this will be his place in the world to come or that his master has any intrinsic superiority over him. He can therefore cheerfully accept, for a time, the place that God has given him, viewing it as a training ground for eternity which will bring an everlasting benefit.