Who said "I've stared into the abyss; the abyss stared back."?

This quote is attributed to Fox Mulder.

I've stared into the abyss; the abyss stared back. - Fox Mulder

"I've stared into the abyss; the abyss stared back."

Fox Mulder Fear

"The truth is out there."

"I want to believe."

"Trust no one."

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

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."