Michael Crichton
"Think about oxygen. Necessary for life now, but oxygen is actually a metabolic poison, a corrosive gas, like fluorine. When oxygen was first produced as a waste product by certain plant cells some three billion years ago, it created a crisis for all other life on earth. Those plants were polluting the environment, exhaling a lethal gas. Earth eventually had an atmosphere incompatible with life. Nevertheless, life on earth took care of itself." [Michael Crichton]

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Joseph Campbell
"Nietzsche was the one who did the job for me. At a certain moment in his life, the idea came to him of what he called 'the love of your fate.' Whatever your fate is, whatever the hell happens, you say, 'This is what I need.' It may look like a wreck, but go at it as though it were an opportunity, a challenge. If you bring love to that momentnot discouragementyou will find the strength is there. Any disaster you can survive is an improvement in your character, your stature, and your life. What a privilege! This is when the spontaneity of your own nature will have a chance to flow.
Then, when looking back at your life, you will see that the moments which seemed to be great failures followed by wreckage were the incidents that shaped the life you have now. You’ll see that this is really true. Nothing can happen to you that is not positive. Even though it looks and feels at the moment like a negative crisis, it is not. The crisis throws you back, and when you are required to exhibit strength, it comes." [Joseph Campbell, Reflections on the Art of Living.]