Few would argue with the statement that we are converted by believing the gospel. But how does the gospel figure into Christian growth or sanctification? Examination of the New Testament documents shows that growth is not stepping out from the gospel, but rather stepping out with the gospel. Many of the problems dealt with in the epistles arise from a failure to apply the gospel to some aspect of life. The solution to this problem is to restore the gospel to its rightful place at the center of our thinking and doing.
--Graeme Goldsworthy, According to Plan: The Unfolding Revelation of God in the Bible (IVP 1991), 219