[Jacob to Bella:] "I'm out of practice with the whole human thing." (4.88)
Jacob doesn't know how to be sensitive to human feelings anymore because he's spent so much time in werewolf form now.
[Bella to Jacob:] "I'm not saying that things will work out easily, Jake. But how could I have lived through all that I've lived through and not believe in magic by this point?" (10.52)
Bella believes that supernatural powers were responsible for the path her life has taken.
[Jacob to Bella:] "It's a killer, Bella" […] [Bella:] "He's not. It's me. I'm just weak and human." (10.100)
Bella assigns the reason for her pain or the nature of her condition to her inadequate human make-up, in order to accommodate a supernatural creature.
[Bella to Jacob:] "You're supposed to be part of my life – I can feel that, and so can you." (15.154)
Bella is convinced that Jacob and her are meant to be in each other's lives, even if it causes them pain right now.
[Edward to Jacob:] "The myths could be easily the products of fear and imagination." (15.201)
Edward thinks that much of what humans believe to be supernatural is just rooted in fear and superstition, so it's hard to distinguish the "real" myths from "human-made" ones.
[Edward to Bella:] "Bella, you're behaving like you're decades rather than days old." (21.122)
Bella's self-control seems supernatural even for the supernatural world. But how much of her self-control has to do with the fact that she made the choice to be a vampire, rather than was forced into it?
[Seth to Bella:] "Lucky thing Ness–Renesmee's not venomous." (23.18)
If Renesmee was venomous she could kill Jacob. Since he imprinted on her, that would be his death sentence – he can't stay away from her, dangerous or not.
[Jasper:] "I can't understand. I can't bear this." (23.115)
Jasper thought he had the rules of the supernatural world all figured out, but Bella has proved herself to be an exception. He has to face the reality that, vampire or not, he always had a choice on how to live his life, too.
[Bella:] Renesmee was… sitting up on the floor with Rose and Emmett hovering over her, playing with a little pile of twisted silverware. She had a mangled spoon in her hand. (25.26)
Bella watches Renesmee, playing on the floor with toys, just like any toddler – except that no normal tike would have the strength to bend silverware. Imagine Renesmee playing with humans her own age…
[Bella:] [Charlie] glanced past me into the house; his eyes were a little wild for a minute as he stared around the big, bright room. Everyone was still there… There was no evidence that the day was coming to a close. (26.47)
Charlie senses that the atmosphere in the room is supernatural, because no one in the room acknowledges that the end of the day is drawing near. So it's his human perception of time that tips him off.