“Only one thing mattered: this was not a Horcrux. Dumbledore had weakened himself by drinking that horrible potion for nothing. Harry crumpled the parchment in his hand and his eyes burned with tears as behind him Fang began to howl.”
“Why can’t I drink the potion instead?” asked Harry desperately.“Because I am much older, much cleverer, and much less valuable,” said Dumbledore.”
“At that moment, Harry fully understood for the first time why people said Dumbledore was the only wizard Voldemort had ever feared. The look upon Dumbledore's face as he stared down at the unconscious form of Mad-Eye moody was more terrible than Harry could have ever imagined. There was no benign smile upon Dumbledore's face, no twinkle in the eyes behind the spectacles. There was cold fury in every line of the ancient face; a sense of power radiated from Dumbledore as though he were giving off burning heat.”
“It's going to be all right, sir," Harry said over and over again, more worried by Dumbledore's silence than he had been by his weakened voice. "We're nearly there ... I can Apparate us both back ... don't worry ...""I am not worried, Harry," said Dumbledore, his voice a little stronger despite the freezing water. "I am with you.”
“Such loyalty is admirable, of course,” said Scrimgeour, who seemed to be restraining his irritation with difficulty, “but Dumbledore is gone, Harry. He’s gone.”“He will only be gone from the school when none here are loyal to him,” said Harry, smiling in spite of himself.”
“And Harry remembered his first nightmarish trip into the forest, the first time he had ever encountered the thing that was then Voldemort, and how he had faced him, and how he and Dumbledore had discussed fighting a losing battle not long thereafter. It was important, Dumbledore said, to fight, and fight again, and keep fighting, for only then could evil be kept at bay, though never quite eradicated. . . .And Harry saw very clearly as he sat there under the hot sun how people who cared about him had stood in front of him one by one, his mother, his father, his godfather, and finally Dumbledore, all determined to protect him; but now that was over. He could not let anybody else stand between him and Voldemort; he must abandon forever the illusion he ought to have lost at the age of one, that theshelter of a parent’s arms meant that nothing could hurt him. There was no waking from his nightmare, no comforting whisper in the dark that he was safe really, that it was all in his imagination; the last and greatest of his protectors had died, and he was more alone than he had ever been before.”