The very first part of that verse caught me. "I, a prisoner for serving the Lord, beg you...." On his journey of faith the apostle Paul was a real go getter, traveling, encouraging, raising up new leaders, and starting new churches. He had a call on his life that seemed to lead him down a certain path on his faith journey with God.
But on the way this ambitious man also had many set backs. He was run out of town, stoned and left for dead, shipwrecked, arrested and eventually as the verse says, a "prisoner" for serving the Lord. He faced a many challenges that could have knocked him off the path. Yet, even in prison he realized that he was on a journey, he had a calling, he could make a difference and an impact no matter what his current situation. He stayed on the path, even by all reasonable assessment one would think prison would limit him.
There are times when I impose my own self limits on my journey. I haven't been in prison for my faith, but there are times when we all look at our situation, our emotional state, our spiritual state and think that God can't do anything through us in our current state of being. How often didn't God take the most adverse situations and conditions and turn it around in such a way that those involved were used by God in tremendous ways. Paul writes in 2 Corinthians 12, "But he (God) said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me."
On your faith journey, don't be limited or discouraged by the place you find yourself in today. Take the next step of faith on your journey and believe that God has a plan and a purpose in your present place and let God's power keep you on the path.