"Yet confident I'll keep what I have sworn?"
As it rimes with 'more,' we must, with 2nd folio, read swore.
"A dangerous law against gentility."
The reading of Collier's folio, garrulity, would agree better with the context; but it is not a Shakespearian term.
"A high hope for a low heaven."
Theobald's reading having has been generally, and I think rightly, adopted; but Mr. Dyce adheres to the text.
"To hear or forbear hearing."