Act IV, Scene VI - King Lear, Gloster and Edgar.

KING LEAR: What, art mad? A man may see how this world goes with no eyes. Look with thine ears: see how yond justice rails upon yond simple thief. Hark, in thine ear: change places; and, handy-dandy, which is the justice, which is the thief? Thou hast seen a farmer's dog bark at a beggar? [...] And the creature run from the cur? There thou mightst behold the great image of authority: a dog's obeyed in office.
Thou rascal beadle, hold thy bloody hand!
Why dost thou lash that whore? Strip thine own back;
Thou hotly lust'st to use her in that kind
For which thou whipp'st her. The usurer hangs the cozener.
Through tatter'd clothes small vices do appear;
Robes and furr'd gowns hide all. Plate sin with gold,
And the strong lance of justice hurtless breaks:
Arm it in rags, a pigmy's straw does pierce it.
None does offend, none, I say, none; I'll able 'em:
Take that of me, my friend, who have the power
To seal the accuser's lips. Get thee glass eyes;
And like a scurvy politician, seem
To see the things thou dost not. Now, now, now, now:
Pull off my boots: harder, harder: so.