Who said "The key to staying sane is to have a goal"?

This quote is attributed to Mark Watney.

The key to staying sane is to have a goal - Mark Watney

"The key to staying sane is to have a goal"

Mark Watney Motivation

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"

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."