Who said "I do not change—I persist. I do not die—I endure."?

This quote is attributed to Sauron.

I do not change—I persist. I do not die—I endure. - Sauron

"I do not change—I persist. I do not die—I endure."

Sauron Perseverance

"One does not simply walk into Mordor without purpose and absolute will."

"The Ring is mine. All that exists serves the master of the Ring."

"I am eternal. I am inevitable. I am the darkness that devours all light."

"Those who resist my rule shall know despair beyond measure."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."