Voldemort

"Dumbledore is dead. I have won."

"You think you are the first person to have discovered this?"

"I wonder how he managed to see anything in this darkness."

"The boy who lived... comes to die."

"Avada Kedavra."

"I see that you have the backbone of a true warrior."

"You are a fool, Harry Potter, and you will lose everything."

"Happiness can be found even in the darkest of times, if one only remembers to look for the light."

"I do not fear you, Potter."

"One cannot be loved without being known."

"Horcruxes are the key to my immortality."

"The wand chooses the wizard, Mr. Potter."

"Dumbledore is nothing compared to my power."

"You are a servant of forces you do not understand."

"I will not be bound by anything or anyone."

"Death is but the next great adventure."

"Those who do not learn from history are doomed to repeat it."

"I have learned much in my years of solitude."

"Strength is found in unity, but I prefer dominion over all."

"Your love will be your undoing."

"I am the most powerful wizard in the world."

"Peace is merely the absence of my wrath."

"Knowledge is power, and I have sought all the knowledge there is."

"You cannot kill what is already dead."

"I have no use for sentiment or weakness."

"The Ministry will fall before me."

"Your pathetic attempts at defiance amuse me."

"I alone have discovered the secrets of immortality."

"Those who follow me will be rewarded beyond measure."

"Muggleborns are beneath me."