From Ryszard Kapuscinski’s book Shah of Shahs (about the last Shah of Iran):
Revolution must be distinguished from revolt, coup d’etat, palace takeover. A coup or a palace takeover may be planned, but a revolution — never. Its outbreak, the hour of that outbreak, takes everyone, even those who have been striving for it, unawares. They stand amazed at the spontanaeity that appears suddenly and destroys everything in its path. It demolishes so ruthlessly that in the end it may annihilate the ideals that called it into being.