Thanks to Gabriel Fluhrer for this quote from D.A. Carson:
"I have been teaching more decades now that I can count and if I have learned anything from all of this teaching, its this: my students...learn what I'm excited about. So within the church of the living God, we must become excited about the gospel. That's how we pass on our heritage. If, instead, the gospel increasingly becomes for us that which we assume, then we will, of course, assent to the correct creedal statement. But, at this point, the gospel is not what really captures us. Rather, is a particular form of worship or a particular style of counseling, or a particular view on culture, or a particular technique in preaching, or - fill in the blank. Then, ultimately, our students make that their center and the generation after us loses the gospel. As soon as you get to the place where the gospel is that which is nearly assumed, you are only a generation and a half from death".