Masters should seek to please the Lord in their dealings with their slaves even as slaves should try to please Christ as they serve their masters. They should not threaten because our heavenly Master does not threaten us. Threatening means warning that punishment will come immediately (cf. Acts 4:17; 29; 9:1). The opposite of threatening is gracious, just, and fair treatment (cf. Col. 4:1; James 5:4). Masters should also remember that their Master in heaven will not show favoritism to them because of their social or economic status. He will evaluate them by the same standard that they have used to judge others (Matt. 7:1-5).
"This is a gentle reminder that earthly rank has no relevance in heaven."152
As we review this section of duties, we need to remind ourselves that only a Spirit-filled believer will be able to fulfill them (5:15-20). Essentially what Paul urged was humility that expresses itself in submissiveness to others rather than arrogant self-assertiveness.
So ends Paul's commands concerning how the Christian is to walk (live; 4:1-6:9): in unity, in holiness, in love, in light, and in wisdom.