Who said "I walk between the world of the living and the dead."?

This quote is attributed to The Night King.

I walk between the world of the living and the dead. - The Night King

"I walk between the world of the living and the dead."

The Night King Philosophy

"The living are not my concern."

"Death is the enemy. And we are joining the fight against it."

"Winter came for House Umber."

"I am the night."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."