They know your cause hath grace, &c.
What Theobald meant, I cannot guess. To me his pointing makes the passage still more obscure. Perhaps the lines ought to be recited dramatically thus:—
They know your Grace hath cause, and means, and might:—
So hath your Highness—never King of England
Had nobles richer, &c.
He breaks off from the grammar and natural order from earnestness, and in order to give the meaning more passionately.
'Ib.' Exeter's speech:—
Yet that is but a crush'd necessity.
Perhaps it may be 'crash' for 'crass' from 'crassus', clumsy; or it may be 'curt,' defective, imperfect: anything would be better than Warburton's ''scus'd,' which honest Theobald, of course, adopts. By the by, it seems clear to me that this speech of Exeter's properly belongs to Canterbury, and was altered by the actors for convenience.
Act iv. sc. 3. K. Henry's speech:—
We would not die in that man's company
That fears his fellowship to die with us.
Should it not be 'live' in the first line?