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• He that knows nothing, doubts nothing.
• He who knows not and knows that he knows not is ignorant.
  Teach him. He who knows not and knows not that he knows not is a fool....
• He who knows nothing doubts nothing. Italian Proverb
• An expert is one who knows more and more about less and less until he knows absolutely nothing about everything.
• An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.
• He who knows nothing, loves nothing. He who can do nothing understands nothing.
  He who understands nothing is worthless. -- Paracelsu...
• He that converses not, knows nothing. -- Thomas Fulle
• Weber's Definition: An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.
• The person who quite clearly knows nothing but thinks that he knows absolutely everything has a very distinct orientation toward a political career.