A lot of Shakespeare, he said, was difficult to the point of verging on incomprehensibility. At least, when one encountered the stuff fresh through the ear in the theatre. You could usually tease out the meaning if you had studied the text beforehand. But if you were exposed for the first time to those lines in the theatre even the sharpest mind floundered.
It wasn't that Shakespeare was writing gobbledygook but that in his last years he had effectively left stage-language behind and was writing difficult poetry: something that could only, comprehensibly, be read.