Severus Snape

"Sentiment has no place in matters of importance."

"You would do well to remember that second chances are not always forthcoming."

"There are things far worse than death, Potter."

"Hope is a dangerous tool when wielded carelessly."

"Silence! Your incessant questioning wearies me."

"One careless mistake could end your life in this classroom."

"Your fame means nothing here."

"The past shapes our future in ways we cannot foresee."

"I do not teach for the sake of entertainment."

"Those who lack discipline lack character."

"Understanding requires more than mere attention."

"You are a constant disappointment, just as your father was."

"There is beauty in precision, if one knows where to look."

"Most students possess neither the wit nor the will for true learning."

"Admiration for the wrong people leads to ruin."

"I have forgotten more about potions than you will ever know."

"Death is but a doorway, though few have the courage to cross it."

"Your recklessness will eventually catch up with you."

"Do not test my patience with foolish questions."

"Excellence is demanded, never given freely."

"The weak prey upon the weaker."

"I expect my students to think, not merely repeat."

"Truth is often unpleasant to those unprepared for it."

"Your potential means nothing without dedication."

"I find your company tiresome in the extreme."

"There is no room for sentiment in the pursuit of power."

"You possess neither the skill nor the intelligence for advanced work."

"Ambition is respectable; stupidity is not."

"The strongest survive while the weak perish."

"I do not tolerate incompetence."