However unknowingly, I had sinned the Ancient Sin, the Great Sin from which there is no escaping. I had sown a seed, and I knew that the tree which sprang from it would bear the death apple.”
-- Artos (chapter 3)

Importance: Artos thinks this after he’s spent the night with Ygerna. He realizes that she is probably right about having a child by him, and equally as right about some evil being brought into the world.

Your true killer slays for pleasure like a wildcat,” Bedwyr said. “This one’s heart is angry, that is a different thing. He is what he is because he was mishandled in his colt days.
-- Bedwyr (chapter 5)

Importance: Bedwyr says this about the black stallion that Artos fancies, but will not buy. In many ways, Artos feels that the boy is also speaking about himself.

I have always been a follower of the Christos, because it has seemed to me...
-- Artos (chapter 9)