Analysis of On a certain Lady at Court

I know the thing that's most uncommon;
  (Envy be silent and attend!)
I know a Reasonable Woman,
  Handsome and witty, yet a Friend.

Not warp'd by Passion, aw'd by Rumour,
  Not grave thro' Pride, or gay thro' Folly,
An equal Mixture of good Humour,
  And sensible soft Melancholy.

`Has she no Faults then (Envy says) Sir?'
  Yes she has one, I must aver:
When all the World comspires to praise her,
  The Woman's deaf, and does not hear.