Voldemort

"Power is the only good worth pursuing."

"Those who speak of my demise are fools and liars."

"I do not require friends. I require servants."

"Ambition is not a flaw, Potter. It is a virtue."

"Your blood carries my mark now."

"The Ministry will fall to my hand."

"Mercy is for the weak."

"I have gone further than any wizard before me."

"You have been marked as my equal, Potter. But you are not."

"All who oppose me shall perish."

"I am not bound by mortal concerns."

"Your love of this world blinds you to true power."

"I have conquered death itself."

"Loyalty to me is the only loyalty that matters."

"Ignorance is the only true weakness."

"I shall return to power stronger than ever."

"The world will be remade in my image."

"You are just a boy, Potter. I am eternal."

"None can stand against me and live."

"I have chosen my path, and none shall turn me from it."

"I have become immortal. I have even conquered death."

"There is no good and evil, there is only power, and those too weak to seek it."

"Fear of a name increases fear of the thing itself."

"Killing Muggles doesn't really count as magic, does it?"

"I am not concerned with elf welfare."

"You dare speak his name?"

"Foolish boy, how could you possibly believe such a thing?"

"I can make bad things happen to people who annoy me."

"Greatness inspires envy, envy engenders spite, spite spawns lies."

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