Philemon 1:6 says, “I pray you may be active in sharing your faith, so that you will have a full understanding of every good thing we have in Christ.”
Explaining what this means is vastly important, not only for the unbeliever who is hearing the gospel, but for the believer who is sharing the gospel. Read below as Mack Stiles explains this unique evangelistic blessing:
Paul has more than evangelism in mind here, but not less. Yet Paul’s prayer is for us to be active in sharing our faith. But notice that the reason is neither the response nor our effectiveness. Paul is saying something I rarely hear: that sharing our faith is for our benefit, too, so that we might gain a full understanding of the good things we have in Christ. The Bible says that among all the good reasons to share our faith, one of them is what happens in us. I think this is important not just for us as individual Christians, but for the community as well.
(Evangelism, Mack Stiles, page 111)