It's pretty straight forward. Decode the message, each letter is consistently-(always) replaced-(maybe) by a different letter in the alphabet.
And don't forget the spoilers!
-This puzzle is what I call a level - 1
Which means that this puzzle is - Straight forward, decently long quote. Including all letters and the name of the quoted person.
Good Luck!
IDR MYDS KJPT YP J KYR ARYLO UYS J GFPDRO, JPT FR AOOGA CFBO JP KYDS. AFR ZFRK J ISORRM WFSC UYS JP KYDS, JPT FR AOOGA CFBO J GFPDRO, PYZ RKJR’A SOCJRFLFRM. ~JCEOSR OFPAROFP