Who said "The sorting hat knows what it's doing."?

This quote is attributed to Hermione Granger.

The sorting hat knows what it's doing. - Hermione Granger

"The sorting hat knows what it's doing."

Hermione Granger

"I do hope you're planning to die, Harry, because if not, you're heading straight for a Muggle hospital."

"It's not who you are underneath, but what you do that defines you."

"Fear of a name only increases fear of the thing itself."

"Books are a uniquely portable magic."