Who said "Every closed door leads to another mystery."?

This quote is attributed to Fox Mulder.

Every closed door leads to another mystery. - Fox Mulder

"Every closed door leads to another mystery."

Fox Mulder Adventure

"The truth is out there."

"I want to believe."

"Trust no one."

"The answers are in the questions we're afraid to ask."

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."