Who said "The dementors leave marks on you if you let them in."?

This quote is attributed to Remus Lupin.

The dementors leave marks on you if you let them in. - Remus Lupin

"The dementors leave marks on you if you let them in."

Remus Lupin Fear

Character in Harry Potter and the Prisoner of Azkaban

Buy "Harry Potter and the Prisoner of Azkaban" on Amazon

"Dementors are among the foulest creatures that walk this earth."

"You're a true wizard, Harry."

"Understanding is the first step to acceptance."

"It is important to ask for help when you need it."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."