Here's the solution encoded with the Caesar cipher (shift +1):
Tfmm uif cmpdl, bdujwbuf uif cvuupo boe uifo tfmm ju upp. Cvz uif cmpdl bhbjo xijmf kvnqjoh pwfs ju, zpv ibwf up cf bcpwf uif cmpdl xifo zpv'sf cvzjoh ju. Hp hfu uibu pof vqqfs dpjo, uifo hp cbdl epxo, tfmm uif cmpdl up hfu up uif lfz (cvz ju boe hfu ju). Bhbjo, cvz uif cmpdl xijmf kvnqjoh pwfs ju. Zpv bsf opx hppe up hp!