Sonnet 76. Why is my verse so barren of new pride?

Why is my verse so barren of new pride?

So far from variation or quick change?

Why with the time do I not glance aside

To new-found methods, and to compounds strange?

Why write I still all one, ever the same

And keep invention in a noted weed

That every word doth almost tell my name

Showing their birth, and where they did proceed?