Goebbels -

 If you tell a lie big enough and keep repeating it, people will eventually come to believe it. The lie can be maintained only for such time as the State can shield the people from the political, economic and/or military consequences of the lie. It thus becomes vitally important for the State to use all of its powers to repress dissent, for the truth is the mortal enemy of the lie, and thus by extension, the truth is the greatest enemy of the State.

Ronald Coase -

 If you torture the data long enough, it will confess to anything.

Julian Simon -

 Simon, the economist who was legendarily skeptical about environmental doom, once posed a question at an environmental forum: “How many people here believe that the earth is increasingly polluted and that our natural resources are being exhausted?” Almost every hand shot up. He then said, “Is there any evidence that could dissuade you?” There was no response, so he asked again, “Is there any evidence I could give you—anything at all—that would lead you to reconsider these assumptions?” Again, no response. Simon concluded, “Well, excuse me. I’m not dressed for church.”