Here are 3 different sayings encoded using the same code:
HRHEZ LBZ BNQB N LBHEHGVEH.
-- LPKKPNF IBNTHICHNEH, "N MVFHYZ VG HEEVEI"
GVE N KPUBQ BHNEQ KPRHI KVOU.
-- IBNTHICHNEH, "KVRH'I KNSVAE'I KVIQ"
ZVA LPKK OVQ SH HKHMQHY QV CASKPM VGGPMH QBPI ZHNE.
I give up!