Severus Snape

"Your potential is wasted on trivial pursuits."

"Change comes only through understanding, not wishful thinking."

"Those who cannot master themselves cannot master anything."

"Do not presume to understand what you have not studied."

"Carelessness is the province of fools."

"I am not here to be your friend, Potter."

"One must learn to think before one acts."

"Your arrogance will be your undoing."

"Respect is earned through competence, not born with fame."

"I see everything, Potter. Everything."

"The world does not reward laziness."

"You are an embarrassment to your name."

"Understanding potion-making requires a disciplined mind."

"Failure is not an option in my classroom."

"Those who seek power must first master themselves."

"I have no interest in your personal troubles."

"Knowledge separates the superior from the inferior."

"There is no magic wand for those unwilling to work."

"Your efforts are beneath even my low expectations."

"I would rather face a dragon than hear you speak."

"Weakness is something I will not tolerate."

"Do not mistake severity for cruelty, Potter."

"The path to mastery is paved with discipline and pain."

"You will learn, or you will fail. Choose wisely."

"The weak cling to friendship as a crutch."

"This is not a place for sentiment or comfort."

"Your ignorance is only exceeded by your audacity."

"I expect obedience before understanding."

"Power is the only truth worth pursuing."

"Sentiment clouds judgment."