He hums. "Whether you feel content about your life changes from moment to moment as much as life does. I think, perhaps, the greatest gift would be to feel content when you inevitably pass on. At least, that's what I'd like for myself."

So it wouldn't have been bad, to die as he is now. He's hardly angry with Clara for saving him, even less so ungrateful, but it would have been a good time to die.