The irrefutable demonstration of a debt forgiven is love. Jesus understood the power of the testimony of a changed life and didn't hesitate to challenge his critics on this one point: if you're not serving Him, you haven't been forgiven.
The Missions Mandate Many Christians argue that if God is sovereign in salvation, there is no need to share the gospel. This common fallacy fails to understand the biblical fact that God has not only ordained the ends of salvation, but the means of it. The means is the necessity for Christians to take the gospel to the ends of the earth in obedience to the Great Commission.