Rush Witt, in his book, Diehard Sins writes:
The gospel is the greatest reality in all the world, and it must become the greatest reality in the small personal worlds that we live in every day. Every heart that will be freed from sin is a heart that must first become overwhelmed by the life-transforming message of the cross. And our sense of awe over Christ and His good news must never fade from view.
The truth is that no one “gets” the gospel. None of us can corner it. We will never master the good news as though we could exhaust its power and move on to something better. The gospel must master us, as we continually explore its endless caverns of redeeming grace and truth. We should be careful, then, to avoid the trap that has ensnared many unsuspecting Christians. It is a serious error to believe that the Christian life must be undergirded by a more fanciful principle than the old-time message of the cross, such as man-made self-help principles or the “secret tricks” said to be hidden in modern psychologies…We must keep the main thing the main thing, and the main thing is the gospel. Are you being mastered daily by the good news of Jesus? (pg. 113)
As we often say at Redeemer, we never outgrow the gospel!