Sharing the good news

Romans 10:14-15 - How, then, can they call on the one they have not believed in? And how can they believe in the one of whom they have not heard? And how can they hear without someone preaching to them?  And how can they preach unless they are sent? As it is written, “How beautiful are the feet of those who bring good news!”
I believe these verses speak to the need for all of us to actively participate in passing along the good news that Christ has died for our sins.  God has chosen us to be the medium of his message, and if we don't participate in that, we completely miss out on part of his mission for us.  Granted, God will get his message out regardless of what we do, but our ability to share the gospel should be considered a blessing for us, not a duty.