The most crucial duty of an evangelist

I have thought about this question lately, "who brought me to Christ?" As I considered it, I realized that while there had been a number of influential people that played a role, one person stands out in my mind, and today I realized why.
Let me ask you a question. What is the most powerful and effective (hint) thing you can do to help someone become born again? I would say that the answer is not share the gospel with them, although that is certainly important. I would say that the most powerful and effective (notice anything about those two words? James 5:16 NIV) thing you can do to bring someone to Christ is continual earnest prayer.
It is my assertion that the most crucial duty of an evangelist is to be in constant prayer for those he is ministering to. After all, it is God who has the power to open the eyes of the blind:

The god of this age has blinded the minds of unbelievers, so that they cannot see the light of the gospel of the glory of Christ, who is the image of God. For we do not preach ourselves, but Jesus Christ as Lord, and ourselves as your servants for Jesus' sake. For God, who said, "Let light shine out of darkness,"made his light shine in our hearts to give us the light of the knowledge of the glory of God in the face of Christ. ~ 2 Cor 4:4-6

It is evident here that the reason people deny the Gospel is because their minds have been blinded by the "god of this age" (Satan). Also we see here that it is God who gives the "light of knowledge." Again, we need to recognize that is is God alone who opens people's heart to the Gospel. He is the one with the power to save.
Now, back to my earlier question. "Who brought me to Christ?"
There was one individual who spent years praying for me. He watched as I continually rejected and blasphemed God, yet he never gave up on me. He would constantly tell me I was being prayed for.
I was living in Madison when I first put my faith in Christ. Eventually, I returned to college in Stevens Point. Upon returning, people whom I had never met would tell me they'd been praying for me while I was in Madison, as my name had been brought up in prayer meetings. They would praise God because I had been saved.
I write all this as a call for all of us to increase our prayers for the lost. Can you see how God is glorified in this? He loves to answer our prayers, and I am convinced that the more prayer that goes into something, the more God is glorified when he acts.
And by the way, Thank you to Reid Anderson.
With love,
Charlie