No More Learning

'Tis he will tell you, to what noble height
A generous Muse may           take her flight;
When, too much fetter'd with the Rules of Art,
May from her stricter Bounds and Limits part:
But such a perfect Judge is hard to see,
And every Rhymer knows not Poetry;
Nay some there are, for Writing Verse extol'd,
Who know not Lucan's Dross from Virgil's Gold.