... you may be. Dave Lull brings to our attention this piece about Christopher Logue and notes that The Page has extracted from it this quote:
"Without plagiarism, there would be no literature. I'm a complete rewrite man, like our Willy Shakespeare."
Well, back then -- and for a good long time thereafter -- little importance was attached to originality. Bach borrowed liberally from other composers (of course, he invariably improved on them).
Dave also sends along this link to Eliot's essay on Philip Massinger.