We never move on from the Gospel; we move on in the Gospel.

Evangelicals have long acted as though the Gospel was the right ‘medicine’ for unbelievers, but that believers need to move beyond the Gospel and go on to other things, a movement from the “milk” to the “meat.” But, this seems untrue—thoroughly out of step with the biblical witness. We believe, rather, that it is imperative to think of moving on from the “milk” of the Gospel to the “meat” of the Gospel. For in fact the Gospel is more profound and multifaceted than our finite minds can ever grasp. We never move on from the Gospel; we move on in the Gospel.

J.I. Packer and Gary Parrett, Grounded in the Gospel: Building Believers the Old-Fashioned Way, 98.