"Either now, or by remissness new-conceiv'd."
For 'now' I felt inclined to read new, with Pope, but I prefer 'now born,' and so I have printed it. (See on All's Well, ii. 3.)
"Are now to have no successive degrees
But here they live to end."
We should for 'here' either read where, or better, with Hanmer, ere.
"Would use his heaven for thunder; nothing but thunder!
Merciful Heaven!"