Human will-power always fails. It is a human attempt to do God's work with our own resources. But working out of self-dependence is guilt-inducing and exhausting. It impels the egoist to seek relief in pleasure and self-fulfillment, to use the good things of God as drugs to escape from reality. Self-fulfillment then takes over as the person's grand task in life leaving the person burdened with suppressed guilt and shame.
Unfortunately the person seeking self-fulfillment never finds happiness. Instead, his inner life shrivels and dries up. But let this person look away from self-interest, fight self-preoccupation, and set the affectional life on Christ and His cause. Christ is alive; He is the giant Son of God. He walks through the earth. Those who walk with Him know that Christ and the cause of the gospel really do introduce us to the deeply satisfying love of God.
--Jack Miller, 'Recovering the Grand Cause,' a paper written in 1993 to set the vision for a missionary training center to be launched in London.