spur quotes

Publicity is the very soul of justice. It is the keenest spur to exertion, and thesurest of allguardsagainst improbity.

-Jeremy Bentham
Draught of a code for the organization of the judicial establishment in France. Collected in  John Bowring (ed)  Works (1838^43), vol.4.

Danger, the spur of all great minds.

- George Chapman
  The Revenge of Bussy d'Ambois, act 5, sc.1.