Analysis of Sonnet 63: Oh Grammar Rules

Oh grammar rules, oh now your virtues show
So children still read you with awefull eyes,
As my young dove may in your precepts wise
Her grant to me, by her own virtue know.

For late, with heart most high, with eyes most low,
I crav'd the thing which ever she denies:
She, lightning Love, displaying Venus' skies,
Lest once should not be heard, twice said, 'No, No.'

Sing then, my Muse, now Io Paean sing,
Heav'n's envy not at my high triumphing:
But grammar's force with sweet success confirm:

For grammar says (oh this, dear Stella, weigh,)
For grammar says (to grammar who says nay?)
That in one speech two negatives affirm.