 Those adults who understood baptism would smile and nod. Those who did not were, I think, at least a bit perplexed, if not somewhat scandalized. Baptism is a death, and it's a death into a rebirth. It's so fundamentally important, even to our Lord, of course, who commissioned his apostles to go and make disciples, baptizing them in the name of the Father and of the Son and of the Holy Spirit.