"The difference between fiction and reality? Fiction has to make sense." 

Tom Clancy

"Reality is what refuses to go away when I stop believing in it."

P. K. Dick

"I believe in looking reality straight in the eye and denying it."

Garrison Keillor

"Reality is usually something you could not have guessed. That is one of the reasons I 
believe Christianity. It is a religion you could not have guessed."

C.S. Lewis

"Nothing can deceive unless it bears a plausible resemblance to reality."

C.S. Lewis

"We are not living in a world where all roads are radii of a circle and where all, if 
followed long enough, will therefore draw gradually nearer and finally meet at the 
centre: rather in a world where every road, after a few miles, forks into two, and each 
of those into two again, and at each fork you must make a decision."

C.S. Lewis, "The Great Divorce"

"...(T)he great majority of mankind are satisfied with appearance, as though they were realities and are often more influenced by the things that seem than by those that are."

Niccolo Machiavelli