Harry Potter and the Half-Blood Prince

"Draco, Draco, you are not a Death Eater."

"It is impossible to manufacture or imitate enthusiasm."

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

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

"We are defined not by our worst moments, but by how we recover from them."

"Sometimes the greatest strength is knowing when not to fight."

"Bonds of blood run deeper than magic."

"Learning never stops for those who seek it."

"Fear of death is the root of much evil."

"Some questions are more important than answers."

"Youth is wasted on the young, as they say."

"Evil often wears a reasonable mask."

"The greatest magic lies within ourselves."

"Acceptance of loss is the first step toward healing."

"Jealousy is a powerful motivator for dark deeds."

"Truth is a beautiful and terrible thing."

"The young are often blind to their own strength."

"Vanity is a weakness, even in the mightiest."

"A memory is a private thing."

"Just because it is happening doesn't mean you have to like it."

"What is the point of having a hidden talent unless you use it?"

"Sometimes you remind me a little of James. He too was convinced that he was right."

"I have nothing to give you but the truth."

"Youth cannot know how age thinks and feels, but old men are guilty if they forget what it was to be young."

"When you have seen as much of life as I have, you will not underestimate the power of obsessive love."

"Love is the most powerful magic of all."

"There is no shame in what you are feeling."

"I am not a book to be read and believed without question."

"The mind is not a book, to be opened at will and examined at leisure."

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