It Mostly Depends OnYour Preconceptions
'The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of a doubt, what is laid before him.'
--Leo Tolstoy, as quoted in the opening of Michael Lewis's new book on the near-meltdown of financial markets. You can review an earlier Tolstoy mention here and a prior mention of Lewis here.