Who said "Death is just another doorway we must pass through."?

This quote is attributed to Pietro Maximoff.

Death is just another doorway we must pass through. - Pietro Maximoff

"Death is just another doorway we must pass through."

Pietro Maximoff Death

"You didn't see that coming?"

"The world is not safe. It never will be."

"We were just children when we lost everything."

"You think you're the only one who can change things?"

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."