Here is 1 saying encoded using a letter for letter replacement:

ID IL SIHED DEKD EY DOO LEOXPZ EKVY EIL PIDDPY RESOBIRPY, EIL FYFOSIYL,
EIL SYKLOB, KBZ CY KCPY DO SYROHBIJY DEY HOOZ IB DEY CKZ, DEY CKZ IB DEY
TOSLD, KBZ LO HSOT HYBDPG OPZ KPP ZOTB DEY XBREKBHIBH ZKGL KBZ ZIY OBY
ZKG PIUY KBG ODEYS ZKG, OBPG LEOSDYS.
-- LKFXYP CYRUYDD, "FKPOBY ZIYL"