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

GMY IEXTYN-XHGGPQ SLOGLPQ OPQGYZG LZ MYXF YUYN HYBN BG ZBQ APZY ZGBGY
EQLU. IH WNPSYZZPN ZOPGG NLOY. LG LZ MYXF LQ CYCPNH PS YFTBNF RYPNRY
YBNXY IEXTYN-XHGGPQ (1803-1873), B NBGMYN WNPXLSLO BQF WPWEXBN (LQ MLZ
GLCY) QPUYXLZG. MY LZ IYZG VQPTQ GPFBH SPN MBULQR TNLGGYQ "GMY XBZG
FBHZ PS WPCWYLL."

TMYQYUYN ZQPPWH ZGBNGZ GHWLQR MLZ QPUYX SNPC GMY GPW PS MLZ FPRMPEZY,
IYRLQQLQR "LG TBZ B FBNV BQF ZGPNCH QLRMG..." MY LZ IPNNPTLQR SNPC XPNF
IEXTYN-XHGGPQ. GMLZ TBZ GMY XLQY GMBG PWYQYF MLZ QPUYX, "WBEX OXLSSPNF,"
TNLGGYQ LQ 1830. GMY SEXX XLQY NYUYBXZ TMH LG LZ ZP IBF:

LG TBZ B FBNV BQF ZGPNCH QLRMG; GMY NBLQ SYXX LQ GPNNYQGZ -- YKOYWG
BG POOBZLPQBX LQGYNUBXZ, TMYQ LG TBZ OMYOVYF IH B ULPXYQG REZG PS
TLQF TMLOM ZTYWG EW GMY ZGNYYGZ (SPN LG LZ LQ XPQFPQ GMBG PEN ZOYQY
XLYZ), NBGGXLQR BXPQR GMY MPEZYGPWZ, BQF SLYNOYXH BRLGBGLQR GMY ZOBQGH
SXBCY PS GMY XBCWZ GMBG ZGNERRXYF BRBLQZG GMY FBNVQYZZ.