Another one of my favorite lines from The Cost of Two Hands:
Oak closed his eyes. Pain’s words reverberated through him. Keep Fighting. Keep Fighting. Did deep roots and life-giving water depend on other Guardians and other men? No. It was the King who kept the waters moving. It was the King who brought the unborn to this world. It was the King who gave Oak his powers and his responsibility. That hadn’t changed just because Oak was chained in the Mall. He had still been chosen to be the Forest Guardian. He had been chosen to hold Bree even if for a moment, and he had been chosen to be here. Just because here had tortures unbearable didn’t mean here was the end. And if it was the end? Joy! For he would take the last road through the final Door to the World Beyond. There was nothing Pain could do to change any of that.