Who said "I am the only constant in an ever-changing universe."?

This quote is attributed to Thanos.

I am the only constant in an ever-changing universe. - Thanos

"I am the only constant in an ever-changing universe."

Thanos Change

"I am inevitable."

"The hardest choices require the strongest wills."

"Perfectly balanced, as all things should be."

"You should have aimed for the head."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."