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• We have more useless information than ignorance of what is useful.
• Ignorance is preferable to error, and he is less remote from the truth who believes nothing, than he who believes what is wrong.
  -- Thomas Jefferson, Notes on the State of Virginia...
• Ignorance of one's ignorance is the greatest ignorance.
• The world always makes the assumption that the exposure of an error is identical with the discovery of truth--that the error and truth are simply opposite.
  They are nothing of the sort. What the world turns to, when it is cured on one error, is usually simply another error, and maybe one worse than the first one....
• Every important document you write will contain at least one egregious typographical error.
  The more pubic the document, the more embarrassing the error....
• A great source of error is the judging of events by abstract calculatio
  which though geometrically true are false as they relate to the concerns of beings governed more by passions and prejudice than by an enlightened sense of their interests....
• From error to error one discovers the entire truth. -- Sigmund Freud
• Mr. Jefferson has reason to reflect upon himself. How he will get rid of his remorse in his retirement, I know not.
  He must know that he leaves the government infinitely worse than he found it, and that from his own error or ignorance....