Here are 3 different sayings encoded using the same code:
PB LBDED NE DSNKD XPY ABUBK WBQE N XYJAC.
-- DPNHBDIBNKB, "KYZBY NAC LJQVBE, VV. 2"
XPBA YAB RJKAD YAB'D RKVCMBD, XPNE N UBKG AVSB WVKB VE ZNHBD.
-- CGQNA EPYZND
GYJ XVQQ UVDVE EPB CJAM IVED YW MQVUB DYYA.
I give up!