For the Father has affection for the Son, and shows him all things that he himself does. He will show him greater works than these, that you may marvel.
And He begins to talk to them now, emphasizing what He's saying with these words verily, verily. And the repetition of the word is for emphasis, it's, "Alright, now hear this." I mean, it's really calling their attention to what I'm about to say.