- Feed http://quotationsbook.com/ Quotations Book Search <![CDATA[The only source of knowledge is experience.]]> http://quotationsbook.com/quote/13352/ http://quotationsbook.com/quote/13352/ <![CDATA[If the facts don't fit the theory, change the facts.]]> http://quotationsbook.com/quote/13623/ http://quotationsbook.com/quote/13623/