Shakespeare's Sonnets: I grant thou wert not married to my muse

I grant thou wert not married to my museAnd therefore may'st without attaint o'er-lookThe dedicated words which writers useOf their fair subject, blessing every book.Thou art as fair in knowledge as in hue,Finding thy worth a limit past my praise,And therefore art enforc'd to seek anewSome fresher stamp of the time-bett'ring days,And do so, love, yet when they have devis'dWhat strained touches rhetoric can lend,Thou truly fair wert truly sympathized,In true plain words, by thy true telling friend; And their gross painting might be better us'd Where cheeks need blood: in thee it is abus'd.