“Extinction is the rule. Survival is the exception.”
― Carl Sagan, The Varieties of Scientific Experience: A Personal View of the Search for God
“...a species must adapt to new conditions in order to survive...the human race consequently finds itself in a new habitat to which it must adapt its thinking.”
― Albert Einstein, Only Then Shall We Find Courage
“It is not the strongest of the species that survives, nor the most intelligent, but rather the one most adaptable to change.”
― Never actually said by Darwin, but it's a nice paraphrase
“Dinosaurs are extinct today because they lacked opposable thumbs and the brainpower to build a space program.”
― Neil deGrasse Tyson, The Sky Is Not the Limit: Adventures of an Urban Astrophysicist