Harry Potter and the Deathly Hallows
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)
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)
"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)