Paul’s teaching in Romans 11:6 is that grace and works are mutually exclusive. “If by grace, then is it no more of works: otherwise grace is not more grace. But if it be of works, then it is no more grace: otherwise work is no more work.” People may be trusting wholly in Christ, wholly in self, or partially in Christ and partially in self. Many unsaved who are related to the church fall into the latter category. However, that position is essentially the same as trusting fully in self. “Assuming that Christ has done his part sufficiently, if I am to be saved I must do my part acceptably. If on the other hand, I am lost, it must be because I did not do enough to win God’s favor.” Thus is the logic of partial trust in Christ and partial trust in self.

D James Kennedy, Evangelism Explosion, 3rd Edition, p. 65.