“And now, compelled by the Spirit, I am going to Jerusalem, not knowing what will happen to me there. I only know that in every city the Holy Spirit warns me that prison and hardships are facing me. However, I consider my life worth nothing to me; my only aim is to finish the race and complete the task the Lord Jesus has given me—the task of testifying to the good news of God’s grace" (Acts 20:22-24).
Paul's main objective was to fulfill his purpose, which was "testifying to the good news of God's grace." More specifically, Paul did that more effectively among the Gentiles than he did with his own people. That is the power and focus of purpose. It is what you do that when you do it, you can sense God partnering with you, and you see results from your work. The Ephesian elders were proof of Paul's effectiveness, for he had established the church there and years later, it was thriving with elders in place.
If you're a church leader, don't assume your purpose statement is simply "preaching." It could be working with a certain age group through counseling, teaching, or practical care. It could also just be your presence, which encourages or challenges people in the Lord's will for their lives. Then again, it may be any of those in a particular area of your city or country, or even a foreign land.
Paul further described his purpose in Galatians 2:7: "On the contrary, they recognized that I had been entrusted with the task of preaching the gospel to the uncircumcised, just as Peter had been to the circumcised." What task has the Lord assigned you? Where are you most fruitful in your ministry work (not where do you hope or think you are most fruitful)? Can you describe it clearly and simply? Is it your aim to finish that race and complete your work like Paul? How can you be more effective?