And not just "about" the Gospel…
At a conference for pastors in Australia a paper was given on preaching. The discussion which followed focused on whether it was always necessary to preach both law and gospel in every sermon. A seminary professor declared, rather vehemently, that he always preached about the gospel in every sermon. At this Sasse got up, shuffled to the microphone and stunned the audience by saying:
That for me sums up Sasse's understanding of the gospel. The gospel was, for him, always an enactment, a performative utterance. And so, even though he often taught as he preached, he always spoke in such a way that Christ spoke through him to grant forgiveness and all his gifts to the faithful.
John Kleinig, "Sasse on Worship"