Why did shakespeare's contemporaries recommend rereading his works, and what might this information suggest to current readers?

Shakespeare's contemporaries recommend rereading his works as it is worth the effort and also eventually we will come to understand them.

Explanation:

Michael Mack's essay or speech "Why Read Shakespeare" is an interactive explanation of why Shakespeare should be reread. His contemporaries, especially John Hemings and Henry Condell, whom Shakespeare refers as "my friends" in his will, recommend it because they recognize that even though his works are difficult and sometimes incomprehensible, one should reread as it will be worth the effort. Just like a music that isn't understood at once but makes sense after listening to it so many times, so is Shakespeare. We can understand the real thing if we take the effort to reread them.  

This suggests that after continuous and re-readings of those confusing passages of Shakespeare, we will be able to fully understand everything eventually.

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