Albus Dumbledore

"Regret is a powerful emotion."

"Half measures are worthless in matters of life and death."

"To know him is to understand why he must be stopped."

"The past lives in us all."

"It is our choices that show what we truly are, far more than our abilities."

"Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy."

"It is impossible to live without failing at something, unless you live so cautiously that you might as well not have lived at all—in which case, you fail by default."

"Love is the most powerful magic of all."

"Voldemort himself created his worst enemy, just as tyrants everywhere do."

"The consequence of your choice will be the same as mine."

"Youth cannot know how age thinks and feels. But in order to become old, you must first be young."

"Ah, yes, Harry, you see the problem, don't you? I am afraid we must accept it."

"It is our choices that show what we truly are, far more than our abilities."

"Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy."

"Voldemort himself created his worst enemy, just as tyrants always do."

"Memory is not what it always was."

"Curiosity is not a sin, but we should exercise caution with our curiosity."

"One cannot be forever cautious."

"I am not worried, Harry. I am with you."

"It is a curious thing, Harry, but perhaps those who are best suited to power are those who have never sought it."

"Help will always be given at Hogwarts to those who ask for it."

"It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends."

"It is our choices that show what we truly are, far more than our abilities."

"It is impossible to live without failing at something, unless you live so cautiously that you might as well not have lived—in which case, you fail by default."

"You care so much you feel as though you will bleed to death with the pain of it."

"Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy."

"Luck is a powerful thing, but it is not something to be relied upon."

"Tom Riddle is the most dangerous dark wizard of all time."

"Draco is not as much of a fool as his father."

"Love is the most powerful magic of all."