Who said "Perhaps you're not cut out for this after all."?

This quote is attributed to Jack Skellington.

Perhaps you're not cut out for this after all. - Jack Skellington

"Perhaps you're not cut out for this after all."

Jack Skellington Courage

"I am the Pumpkin King!"

"How wonderful! How strange! Oh, how I love it so!"

"There's something kind of funny about the whole thing."

"I've grown so weary of the same old thing."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."