“The truth." Dumbledore sighed. "It is a beautiful and terrible thing, and should therefore be treated with great caution.”

“The Prophet is bound to report the truth occasionally,' said Dumbledore, 'if only accidentally.”

“My word, Severus, that I shall never reveal the best of you?’ Dumbledore sighed, looking down into Snape’s ferocious, anguished face. ‘If you insist …”

“Curiosity is not a sin.... But we should exercise caution with our curiosity... yes, indeed.”

“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.”

“La verdad -Dumbledore suspiró- es una cosa terrible y hermosa, y por lo tanto debe ser tratada con gran cuidado.”

“Curious indeed how these things happen. The wand chooses the wizard, remember...I think we must expect great things from you, Mr. Potter... After all, He-Who-Must-Not-Be-Named did great things — terrible, yes, but great.”