I often say from the pulpit that none of us are, nor ever will be, “gospel graduates.” Many have made this point throughout church history. Here is one contemporary example from Jared Wilson’s book, Gospel Deeps.
If the gospel is not the ABCs of the Christian life but the A to Z, we can expect that the gospel is for all of life, not just the moment of conversion. The gospel’s saving work is deep work.
The gospel forgives our sins once for all. It gives us a new identity. It secures us citizenship in heaven and the hope of eternal life. Once believed, it is the grounds of our justification; thereafter believed, it is the power of our sanctification; finally believed, it results in our glorification. (pg. 41)
In the introduction to his study of Galatians entitled, Galatians for You, Tim Keller writes:
It’s very common in Christian circles to assume that “the gospel” is something mainly for non-Christians. We see it as a set of basic “ABC” doctrines that are the way in which someone enters the kingdom of God. We often assume that once we’re converted, we don’t need to hear or study or understand the gospel—we need more “advanced” material.
But in this short letter, Paul outlines the bombshell truth that the gospel is the A to Z of the Christian life. It is not only the way to enter the kingdom; it is the way to live as part of the kingdom. It is the way Christ transforms people, churches and communities.
We’re going to watch Paul challenge them, and us, with the simple truth that the gospel is not just the ABC of Christianity, but the A to Z—that Christians need the gospel just as much as non-Christians. (pg. 9)
Indeed, there is nothing more “advanced” than the gospel. In his letter to the Ephesians, Paul writes that he was called by God to preach the “unsearchable riches of Christ” to the Gentiles (3:8). We will never exhaust the depths of the gospel!
“Therefore, as you received Christ Jesus the Lord, so walk in him, rooted and built up in him and established in the faith, just as you were taught, abounding in thanksgiving.” –Colossians 2:6-7