Puzzle 52: Cryptograms

In a cryptogram, each letter of the alphabet is replaced by another letter. This is a consistent replacement that holds throughout the whole text. For instance, if D replaces A and L replaces B, then DLLD would stand for ABBA.
You need to figure out what the original text was.

הפעם החידה היא רק באנגלית. אני אשתדל לפצות עם חידה רק בעברית בעתיד...

The Cryptogram:

DANSKRNSD R PRS EQELS EK TRJCK, ETH QATHSY RO NU PROS QAVPH XS HROOSYSTK RO R CEH KA HA RK ABSY... KCST E BARZS ZANSD KA NS AVK AO KCS HEYL KCEK DEUD, "XAU, KCSYS'D ET AYRJRTEP KCAVJCK!"

-- Charlie Brown