Quote 4
"Did you win?"
Luce laughed a sad, self-effacing laugh and shook her head. "Far from it."
Daniel pursed his lips. "But you were always…"
"I was always what?"
"I mean, you look like you might be a good swimmer," He shrugged. "That's all." (6.79-83)
So Daniel's memories of Luce are even more all-encompassing than he lets on, but all of his thoughts are self-censored because he knows Luce incredibly well yet can't tell her that. He feels he is forced to push her away.
Quote 5
"I'm trying to say…I guess you could say I'm damned too, Luce. I've been damned for a long, long time." He spoke as if the words tasted bitter. "I made a choice, once, a choice that I believed in—that I still believe in…" (16.132)q
At least Daniel is good about sticking to his principles. Whether the choice he made was ultimately worth the price he paid for it is neither here nor there, but by calling himself damned, he indicates that he feels he needs to be redeemed, too. Maybe he hopes that by telling Luce this, she might begin to believe him.
Quote 6
"Warm milk with a spoonful of treacle," he murmured sadly, his back still to her. Then he added sadly, "It helps you sleep." (Prologue. 17)
Here we see Daniel (not yet named) showing how much he cares for Luce (also not yet named, since we're in Prologue Land)—and how much he remembers about her character. Learning and remembering someone's eating habits is an intimate thing, and Daniel's concern for Luce's sleeplessness, paired with his wish to help her fall asleep, is especially telling: it suggests that he knows a great deal about her and cares for her a lot. It's also the only instance in the story when Daniel and food are connected; we usually Cam and food connected instead. Basically, Cam + food = potential danger, while Daniel + food = comfort and safety.