Who said "This subject requires more than casual attention."?

This quote is attributed to Severus Snape.

This subject requires more than casual attention. - Severus Snape

"This subject requires more than casual attention."

Severus Snape Education

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

"Dunderheads. All of you. Particularly you, Potter."

"I can teach you how to bottle fame, brew glory, even put a stopper in death."

"One sip of this potion would make a man invincible."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."