Who said "I've been alone for months and I'm still sane. Mostly."?

This quote is attributed to Mark Watney.

I've been alone for months and I'm still sane. Mostly. - Mark Watney

"I've been alone for months and I'm still sane. Mostly."

Mark Watney Humor

Character in The Martian

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"I'm going to have to science the shit out of this (paraphrased)"

"Humans are really resilient - we adapt quickly to circumstances"

"The key to survival is solving problems one at a time"

"Humor and maintaining perspective are essential to survival"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."