Harry Potter and the Deathly Hallows
How we cite our quotes:
The elf's eyes found him, and his lips trembled with the effort to form words.
And then with a little shudder the elf became quite still, and his eyes were nothing more than great glassy orbs, sprinkled with light from the stars they could not see. (23.131-133)
Dobby's love for Harry is the stuff of legend – the brave little elf is willing to die for his hero, and it's heartbreaking to see his loyalty, right up to the end.
His scar burned, but he was master of the pain; he felt it, yet was apart from it. He had learned control at last, learned to shut his mind to Voldemort, the very thing Dumbledore had wanted him to learn from Snape. Just as Voldemort had not been able to possess Harry while Harry was consumed with grief for Sirius, so his thoughts could not penetrate Harry now, while he mourned Dobby. Grief, it seemed, drove Voldemort out… though Dumbledore, of course, would have said that it was love… (24.8)
Is love really so different from grief, though? Harry's sorrow for the loss of those who have given themselves up for his sake is made a thousand times more bitter because of his love for them. Perhaps both of these things are what keep Harry closed off from Voldemort's mind.
"Funny thing, how many of the people my brother cared about very much ended up in a worse state than if he'd left 'em well alone." (28.55)
Aberforth observes a curious phenomenon about his brother's love – it often ended up hurting people, the very same ones he professed to love. Well, love does hurt, after all.