Crack the Code...

Today's brain bender....

A simple substitution code has been used to conceal a "quote." Work out the code to decipher the original words.

Hamlet:
QFPQMF EPO'U SFBMJAF IPX IBSE JU JT UP TQFBL JO CMBOL WFSTF


Any ideas? Leave them in the comments. I'll post the correct quote this afternoon.

Happy Friday!

Update: Today's official smartypants is bigdocmcd with the correct answer. The quote is in the comments but Q = P, F = E cracks the code. :)