I have thought it necessary to send to you Epaphroditus my brother and fellow worker and fellow soldier, and your messenger and minister to my need, (ESV)
When you read this verse the first thing that comes to mind is, who is Epaphroditus? That is a very good question. Outside of this book of Philippians we do not hear of him. Epaphroditus would have been a common name for a fellow Philippian. His name meant "favorite of Aphrodite." Aphrodite was the goddess of love in Greek mythology. Epaphroditus was a believer from Philippi.
Just as Paul had been blessed to have Timothy in Rome supporting him, he also had Epaphroditus. The Philippian believers had sent him to Paul to be a messenger for them, bringing primarily financial gifts to Paul so that he could be cared for in his prison cell in Rome. At the end of this letter to Philippi we find out about the gift that Epaphroditus brought to Paul:
 I have received full payment, and more. I am well supplied, having received from Epaphroditus the gifts you sent, a fragrant offering, a sacrifice acceptable and pleasing to God. (ESV)
Paul describes Epaphroditus as his brother, fellow worker, fellow soldier, messenger, and minister to his need. As is often the case, in the work of the ministry there are many people behind the scenes that are vital to God's work being carried out. Paul would not have survived, much less be sending letters to various churches, if it weren't for godly men who were willing to be a support.
How is God using you in ministry? Are you on the front lines? Or are you in the background being a support to someone else? Whatever God calls you to do, it is necessary. Do it with joy for his glory!