This one gave me goosebumps!
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Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe? The usual approach of science of constructing a mathematical model cannot answer the questions of why there should be a universe for the model to describe. Why does the universe go to all the bother of existing?

– Stephen W. Hawking, A Brief History of Time: From the Big Bang to Black Holes, Bantam, NY, p 174 (1988)