"Paul an apostle of Christ Jesus by the will of God...
An apostle is one who is sent on a mission. Paul was sent. The first thing that comes to mind is that Paul did not choose this for himself. If you remember his story, he was doing the exact opposite. He was on a self-imposed, legalistic mission to destroy the church. He thought he was serving God.
I wonder how many of us are on self-imposed missions that we think are serving God and His kingdom. I wonder how much damage we do because we think we are right. Will God have to knock us off our donkeys? That is a painful way to learn the Truth.
A better plan would be to sit in silence for a while and wait for God to speak. God has a purpose and mission for each one of His children. The primary purpose is the life-long goal of learning to know God better. After we settle into that, there are many other things He has designed for us to do...if we will but listen and obey.