Who said "Life itself is the disease, and I am the cure."?

This quote is attributed to The Night King.

Life itself is the disease, and I am the cure. - The Night King

"Life itself is the disease, and I am the cure."

The Night King Death

"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."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."