The truly changed, truly converted, truly Christian heart can say with John Newton, “I am not what I ought to be. I am not what I wish to be. I am not what I hope to be. Yet I can truly say, I am not what I once was. By the grace of God, I am what I am.
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.
Let's say you don't want to stress the urgency of the gospel. Imagine that you are a hyper-Calvinist, and you just figure that people's salvation is a matter for the sovereignty of God. Well, if that's the case, there will never be the heartfelt pleading that you would see in a Spurgeon or an Edwards, or in the Apostle Paul where he pours out his heart in Romans 9 and 10 for the Jewish people.
Let'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.
We need to be realistic and recognize that there will be times when we won't be sharing our faith out of an overwhelming sense of joy. When that happens, that's a call to look at our own devotional lives. Are we putting our hearts and minds before the Lord and under his cross everyday? Do we remind ourselves continually that we have been ransomed by the death of the Saviour? When we meditate on Christ's death for us, it doesn't mean that we never have struggles in our obedience, but it does help.
