Belief is a wonderful way to pass the time until the facts come in.
None of us understand the infinite universe. Most people who start thinking about it, get overwhelmed, shrug their shoulders, and turn their attention back to something mundane, like drinking beer or watching TV. Only a few great minds have ever actually contemplated the nature of the universe. Fewer still have done it without going insane.
It was the ghost of rationality itself ... This is the ghost of normal everyday assumptions which declares that the ultimate purpose of life, which is to keep alive, is impossible, but that this is the ultimate purpose of life anyway, so that great minds struggle to cure diseases so that people may live longer, but only madmen ask why. One lives longer in order that he may live longer. There is no other purpose. That is what the ghost says.