We should want to evangelize because of the joy that God puts in our hearts. Ultimately, that's the best reason for sharing our faith.
Mark DeverWe do not fail in our evangelism if we faithfully tell the gospel to someone who is not subsequently converted; we fail only if we do not faithfully tell the gospel at all.
Mark DeverAs a pastor, I have the opportunity every week to share the gospel publicly in a way that most of the members sitting in our church do not. However, that doesn't absolve them of the responsibility for reaching others with the gospel.
Mark DeverLet's say that you want to do everything out of the joy that comes from knowing the Lord. Well, a lot of people aren't built like that emotionally. If they think that some sort of feeling is the basis for their action, they are going to feel justified sitting around, although they are going to feel bad that they have never taken one step of obedience because their heart is cold.
Mark Dever