My dear John Russell, Till lately I had strong confidence in the fair intentions of Napoleon towards England, but of late I have begun to feel great distrust and to suspect that his formerly declared intention of avenging Waterloo has only lain dormant and has not died away. He seems to have thought that he ought to lay his foundation by beating with our aid or with our concurrence, or our neutrality first Russia and then Austria: and by dealing with them generously to make them his friends and in any subsequent quarrel with us.

Letter to Lord John Russell (4 November 1859), quoted in Jasper Ridley, Lord Palmerston (London: Constable, 1970), p. 534.