4:7-9 Ministers are servants to Christ, and fellow-servants to one another. They have one Lord, though they have different stations and powers for service. It is a great comfort under the troubles and difficulties of life, to have fellow Christians caring for us. Circumstances of life make no difference in the spiritual relation among sincere Christians; they partake of the same privileges, and are entitled to the same regards. What amazing changes Divine grace makes! Faithless servants become faithful and beloved brethren, and some who had done wrong, become fellow-workers of good.
8. for the same purpose—Greek, "for this very purpose."
that he might know your estate—Translate, "that he may know your state": answering to Col 4:7. So one very old manuscript and Vulgate read. But the oldest manuscripts and the old Latin versions, "that YE may know OUR state." However, the latter reading seems likely to have crept in from Eph 6:22. Paul was the more anxious to know the state of the Colossians, on account of the seductions to which they were exposed from false teachers; owing to which he had "great conflict for" them (Col 2:1).
comfort your hearts—distressed as ye are by my imprisonment, as well as by your own trials.