Shakespeare's Sonnets: Who is it that says most, which can say more

Who is it that says most, which can say moreThan this rich praise, that you alone are you,In whose confine immurèd is the storeWhich should example where your equal grew?Lean penury within that pen doth dwellThat to his subject lends not some small glory,But he that writes of you, if he can tellThat you are you, so dignifies his story.Let him but copy what in you is writ,Not making worse what nature made so clear,And such a counter-part shall fame his wit,Making his style admirèd every where. You to your beaut'ous blessings add a curse, Being fond on praise, which makes your praises worse.