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You cannot govern, you cannot administrate, with an ignoramus.
You cannot make a revolution with silk gloves.
You cannot survive if you do not know the past.
You cannot play naive if you're not.
You cannot say that you are happy when you don't win.
If you cannot concentrate, you are not so happy.
You cannot make horses 'safe.'
You cannot step into the same river twice.
You cannot play with fire.