MASTER: Some say that's where it all began, when he was a child. That's when the Doctor saw eternity.
MASTER: As a novice, he was taken for initiation. He stood in front of the Untempered Schism. It's a gap in the fabric of reality through which could be seen the whole of the Vortex. We stand there, eight years old, staring at the raw power of time and space, just a child.
MASTER: Some would be inspired. Some would go mad. And some would just... run away.
LUCY: What about you, my love?
MASTER: Oh, the one who was inspired. I still am!