“It [traveling to Mars] is important for our future. If the dinosaurs had a space program, they'd still be here.”
            In a  Reddit IAmA. http://www.reddit.com/r/IAmA/comments/r62jp/iama_nasa_astronaut_that_recently_returned_to/c437ubd (2012) 
An earlier similar quotation can be found in: 
The dinosaurs became extinct because they didn't have a space program. And if we become extinct because we don't have a space program, it'll serve us right! 
By Larry Niven As quoted by Arthur C. Clarke in  "Meeting of the Minds : Buzz Aldrin Visits Arthur C. Clarke" by Andrew Chaikin (27 February 2001) http://web.archive.org/web/20010302082528/http://www.space.com/peopleinterviews/aldrin_clarke_010227.html
        
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                        As quoted by Arthur C. Clarke in "Meeting of the Minds : Buzz Aldrin Visits Arthur C. Clarke" by Andrew Chaikin (27 February 2001) http://web.archive.org/web/20010302082528/http://www.space.com/peopleinterviews/aldrin_clarke_010227.html
 
                            
                        
                        
                        “People should be travelling to Mars and doing it in our lifetime.”
                                        
                                        Page 9 
Conversation: Elon Musk on Wired Science (2007), Foreword to Marc Kaufman's  Mars Up Close: Inside the Curiosity Mission https://books.google.com/books/about/Mars_Up_Close.html?ido6XaCwAAQBAJ&hlen. National Geographic. ISBN 978-1-4262-1278-9.
                                    
 
                            
                        
                        
                        
                                        
                                         "Meeting of the Minds : Buzz Aldrin Visits Arthur C. Clarke" by Andrew Chaikin (27 February 2001) http://web.archive.org/web/20010302082528/http://www.space.com/peopleinterviews/aldrin_clarke_010227.html 
2000s and posthumous publications
                                    
 
                            
                        
                        
                        
                                        
                                        Page 10 
Conversation: Elon Musk on Wired Science (2007), Foreword to Marc Kaufman's  Mars Up Close: Inside the Curiosity Mission https://books.google.com/books/about/Mars_Up_Close.html?ido6XaCwAAQBAJ&hlen. National Geographic. ISBN 978-1-4262-1278-9.
                                    
 
                            
                        
                        
                        “If we found life on Mars, it would change everybody's view of our place in space.”
[NewsBank, Mike Anton, Los Angeles Times, The Seattle Times, Seattle, Washington, Fully loaded robot heading off to Mars, November 20, 2011]
 
                            
                        
                        
                        “Dinosaur fossils? God put those here to test our faith.”
                                        
                                        Source: Revelations  (1993) 
Context: I think God put you here to test my faith, dude. Does that bother anybody else—the idea that God might be … fucking with our heads? I have trouble sleeping with that knowledge. Some prankster God running around, [pantomimes digging] "We'll see who believes in Me now! I am the Prankster God. I am killing Me!"
                                    
 
                            
                        
                        
                        
                                        
                                        Crucible of Creativity (2005) 
Context: Putting a new feature into a program is important, but refactoring so new features can be added in the future is equally important. The ability to do things in the future is something that I consider suppleness, like clay your hands that accepts your expression. Programs and documents get brittle very quickly. Wiki imagines a more dynamic environment where we accept change...
                                    
 
        
     
                             
                            