Who said "To survive is to prove one's fitness for existence."?

This quote is attributed to Hermann Muller.

To survive is to prove one's fitness for existence. - Hermann Muller

"To survive is to prove one's fitness for existence."

Hermann Muller Motivation

Geneticist American 1890–1967

"Life is what happens when you're busy making other plans"

"The only way to do great work is to love what you do"

"In the middle of difficulty lies opportunity"

"Be yourself; everyone else is already taken"

"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."