Mercy and Justice--Measure for Measure is a play that balances Mercy against Justice and pride against humility. Vincentio the Duke of Vienna tells his people that he is leaving on a diplomatic mission and will leave the city in the care of a judge Angelo. But the Duke does not leave he disguises himself and see how his fair city is run in his absence.No ceremony that to great ones 'longs Not the king's crown nor the deputed sword The marshal's truncheon nor the judge's robe Become them with one half so good a graceAs mercy does.