Jesus therefore answered them, "Most assuredly, I tell you, the Son can do nothing of himself, but what he sees the Father doing. For whatever things he does, these the Son also does likewise.
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.