Love's Burning-Glass

Wondering long, how I could harmless see
Men gazing on those beams that fired me.
At last I found it was the crystal, Love,
Before my heart that did the heat improve :
Which, by contracting of those scatter'd rays
Into itself, did so produce my blaze.
Now, lighted by my love, I see the same
Beams dazzle those, that me are wont t' inflame
And now I bless my love, when I do think
By how much I had rather burn than wink.
But how much happier were it thus to burn,
If I had liberty to choose my urn !
But since those beams do promise only fire.
This flame shall purge me of the dross. Desire.