This is a monoalphabetic substitution cipher, using a more general system (i.e., not just using a shift). Punctuation and capitalization left intact as a major clue. Mct gfzcm xw mct atxaot mx kt jtnpgt fu mctfg atgjxuj, cxpjtj, ahatgj, huq twwtnmj, hzhfujm pugthjxuhkot jthgnctj huq jtfepgtj, jchoo uxm kt sfxohmtq, huq ux Vhgghumj jchoo fjjpt, kpm paxu agxkhkot nhpjt, jpaaxgmtq kb Xhmc xg hwwfgrhmfxu, huq ahgmfnpohgob qtjngfkfuz mct aohnt mx kt jthgnctq, huq mct atgjxuj xg mcfuzj mx kt jtfetq.