text: Sure do--but that power has limits.  The pope cannot change revealed truth.
  
  For example: the power of the keys does not allow the pope to overturn the Council of Nicaea.  The pope could not decide that we will no longer worship Jesus as God.  The pope could not decide to overturn the doctrine on the Trinity, etc.   
  
  Again, the power of the keys empowers the pope to teach God's Truth and ensures the Church will never teach error--at the universal and official level.  The power of the keys does not give the pope a license to do whatever he wants or make up teaching as he goes.  Catholics are not Sola Roma Ecclesia!