Something else is needed: a tenacious pastor who goads his or her church to reach across racial lines, interracial church scholars say.

CNN: Why many Americans prefer their Sundays segregated

Scientists, including some of those at the IPCC, have sometimes played along with this, looking for harbingers of catastrophe to act as goads to change.

ECONOMIST: Climate change

For the Greeks, the medical term for rabies (lyssa) also described an extreme sort of murderous hate, an insensate, animal rage that seizes Hector in "The Iliad" and, in Euripides' tragedy of Heracles, goads the hero to slay his own family.

WSJ: Rabies: The Plague Behind Zombies and Vampires

If Mr Hazare's movement goads the government into bringing out a firm anti-graft law - the jury is still out on that one - and both he and the politicians learn their lessons from the experience, it would have served its purpose.

BBC: Has Anna Hazare's campaign run its course?

Carwyn Jones, expecting the last word, goads Mr Davies for failing to fill Nick Bourne's shoes (the former Tory leader who 'many of us' in the chamber had admired.) "He does nothing unless he's been told to do it by the Secretary of State!"

BBC: A rumble in the political jungle