Who said "I do not expect you to understand, nor do I care if you do."?

This quote is attributed to Severus Snape.

I do not expect you to understand, nor do I care if you do. - Severus Snape

"I do not expect you to understand, nor do I care if you do."

Severus Snape Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."