it ought to be remembered that there is nothing 
  more difficult to take in hand, more perilous 
  to conduct, or more uncertain in its success, 
  than to take the lead in the introduction of a 
  new order of things. Because the innovator has 
  for enemies all those who have done well under 
  the old conditions and lukewarm defenders in 
  those who may do well under the new. 
  (Machiavelli, The Prince, Chapter VI)