This is the point.
The duke is very strangely gone from hence;
Bore many gentlemen, myself being one,
In hand and hope of action: but we do learn
By those that know the very nerves of state,
His givings-out were of an infinite distance
From his true-meant design. Upon his place,
And with full line of his authority,
Governs Lord Angelo; a man whose blood
Is very snow-broth; one who never feels
The wanton stings and motions of the sense,
But doth rebate and blunt his natural edge
With profits of the mind, study and fast.
He--to give fear to use and liberty,
Which have for long run by the hideous law,
As mice by lions--hath pick'd out an act,
Under whose heavy sense your brother's life
Falls into forfeit: he arrests him on it;
And follows close the rigour of the statute,
To make him an example. All hope is gone,
Unless you have the grace by your fair prayer
To soften Angelo: and that's my pith of business
'Twixt you and your poor brother.