The Gospel is such a good thing that one wonders why it’s not self-marketing like the best industrial products do.
If it would be natural for all the converts to tell all their friends and neighbours about the Gospel, it could be called self-marketing. The story of he Samaritan woman in John 4 is one where the Gospel had self-marketing effects.
Revival times seem to be those where the Gospel is self-marketing. It is to be determined what conditions must be in place for such a revival to start. Esp. in our society. Perhaps it’s necessary to be able to talk about God and being taken seriously in the average case. If yes, what would be necessary for that? Second Acts or one of its results, like a movie?