Who said "It will take more than that to explain why you are here."?

This quote is attributed to Severus Snape.

It will take more than that to explain why you are here. - Severus Snape

"It will take more than that to explain why you are here."

Severus Snape

Character in Harry Potter and the Half-Blood Prince

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"Once again, you have allowed your emotions to distract you from what is really important."

"The mind is not a book, to be opened at will and examined at leisure."

"I am not interested in your opinions, you silly boy."

"Sit down. Sit. SIT!"