“Fools who wear their hearts proudly on their sleeves, who cannot control their emotions, who wallow in sad memories and allow themselves to be provoked this easily — weak people, in other words...”

“Then you will find yourself easy prey for the Dark Lord!" said Snape savagely. "Fools who wear their hearts proudly on their sleeves, who cannot control their emotions, who wallow in sad memories and allow themselves to be provoked so easily - weak people, in other words - they stand no chance against his powers! He will penetrate your mind with absurd ease, Potter!”

“I cared more about your happiness than your knowing the truth, more for your peace of mind than my plan, more for your life than the lives that might be lost if the plan failed. In other words I acted exactly as Voldemort expects we fools who love to act.”

“It is a curious thing, Harry, but perhaps those who are best suited to power are those who have never sought it. Those who, like you, have leadership thrust upon them, and take up the mantle because they must, and find to their own surprise that they wear it well.”

“Unlike any other creature on this planet, human beings can learn and understand without having experienced. They can think themselves into other peoples’ places. Of course, this is a power like my brand of fictional magic that is morally neutral. One might use such a power to manipulate or control, just as much as to understand or sympathize. And many prefer not to exercise their imaginations at all. They choose to remain comfortably within the bounds of their own experience, never troubling to wonder how it would feel to have been born other than they are. They can refuse to hear screams or peer inside cages. They can close their hearts and minds to any suffering that does not touch them personally. They can refuse to know. I might be tempted to envy people who can live that way, except that I do not think that they have any fewer nightmares than I do.”

“It seemed impossible that there could be people in the world who still desired food, who laughed, who neither knew nor cared that Sirius Black was gone forever.”

“Wands are only as powerful as the wizards who use them. Some wizards just like to boast that theirs are bigger and better than other people's.”