“But you're dead," said Harry.
"Oh yes," said Dumbledore matter-of-factly.
"Then...I'm dead too?"
"Ah," said Dumbledore, smiling still more broadly. "That is the question, isn't it? On the whole, dear boy, I think not.”
They looked at each other, the old man still beaming.
"Not?" repeated Harry.
"Not," said Dumbledore.
"But…" Harry raised his hand instinctively toward the lightning scar. It did not seem to be there. "But I should have died—I didn't defend myself! I meant to let him kill me!"
"And that," said Dumbledore, "will, I think, have made all the difference.” - Harry Potter and the Deathly Hallows