Did you know, as a follower of Christ, you have a responsibility to everyone you meet? Every person that God places in your world, He is calling to Him. It's your responsibility to be His voice in those moments, to get their attention so to speak. People need other people to help them get to Him, because we can't do it on our own. In this great plan, we're not supposed to. We need to help each other move into a place of God's grace.
Remember that the next time you grumble about the people ahead of you in line at the bank, or during rush hour, or any other moment when all other humanity is an 'inconvenience' to you. They NEED you - God needs you to call to them for Him.