Joy for being a Christian
Every time he he remembers the people of the church in Philippi, he pray with joy and thankfulness. Because the people have participating in Paul's missionaries since the first day he started it there. His joy comes from his confidence on God who is the true one, who will make their faith perfect on the day Jesus comes again.
If you are not a Christian, how do they appear to you? If you are, what are some inside/outside changes you have experienced since the first day you were baptized?