Once you identify the core pattern, merely check your work and solve the riddle. The next step will be a simple reversal of the solution.
Hint: in memoriam for a poet who got ratio'd too hard.
https://pastebin.com/2PSAJhCy
Fyqfsjfodf, uipvhi oppo bvdupsjuff
Ckxk ot znoy cuxrj, oy xomnz etumn lux sk
Up tqflf pg xp uibu jt jo nbsjbhf;
Nwz, twzlgvoma, aqbp Q bemtdm gmmz eia wn iom,
Thonked be God that is eterne on lyve,
Krxverqghv dw fklufkh gruh L kdyh kdg ibyh --
Li L vr riwh pbjkwh kdyh bzhgghg ehh --
Jwm juun fnan fxacqh vnw rw qra mnpann.
Jcb um eia bwwtl, kmzbmgv, vib twvom iowwv qa,
Bpib aqbp bpib Kzqab vm emvbm vmdmzm jcb wvqa
Av dlkkfun, pu aol Jhul vm Nhspsll,
Xlex fc xli weqi irweqtpi xeyklxi li qi
Cqjc R wn bqxumn fnmmnm kn kdc xwnb.
Pmzsvm mms, tw, epqkp i apizx ewzl nwz bpm vwvma,
Krbrmn j fnuun, Sqnbdb, Pxm jwm vjw,
Wteo mr vitviizi sj xli Weqevmxer
Bpwc piab gpil ngdm pwcajwvlma,' ycwl pm,
`Erh xlex mpoi qer xlex rsa lexl xlii
Qa vwopb bpgv pwcajwvlm,' bpca amglm pm kmzbmgv.
Yjcv vjcv jg ogpvg vjgtda, K mcp pcv ugap;
But that I axe, why that the fifthe man
Aew rssr lsywfsrhi xs xli Weqevmxer
Mtb rfsdj rdlmyj xmj mfaj ns rfwnflj
Gmb pmzlm Q vmdmzm bmttmv qv ugv iom
Avut znoy tushxk jollotoiouat.
Umv uig lmdgvm ivl otwamv, cx ivl lwcv,
Exw zho L zrrw, hasuhv, zlwkrxwh obh,
Ksh feh yw jsv xs aibi erh qypxmtpci;
Wkdw jhqwlo whaw ndq L zho xqghuvwrqgh.
Kkq ckr O cuuz, nk ykejk set nuayhutjk
Xmtqij qjyj kfijw fsi rttijw fsi yfpj yt rj.
Haz ul tu tushxk sktiout sgjk nk,
Ri eljdpbh, ru ri rfwrjdpbh;
Epg apwtlm umv bpivvm axmsm wn qb dqtmgvgm
Mp, iffsf uif xjtf lzoh, ebvo Tbmpnpo;
J uspxf if ibeef xzwft np uibo ppo.
Hz dvskl Nvk pa slclmbs dlyl buav tl
Av il ylmylzzolk ohsm zv vmal hz ol!
Yjkej akhvg qh Iqf jcffg jg hqt cnng jku yaxau!
No man hath swich that in this world alyve is.
Jrg zrrw, wklv qreoh nbqj, dv wr pb zlw,
The firste nyght had many a myrie fit
Frcq nlq xo qnv, bx fnu fjb qhv xw uhen.
Zcmfttfe cf Hpe uibu J ibwf xfeefe gzwf!
[Vm dopjol P ohcl wfrlk vba aol ilzal,
Kxcqn xo qnan wncqna ydab jwm xo qnan lqnbcn.
Lqdmzam akwtma uismv xizngb ktmzsma,
And diverse practyk in many sondry werkes
Rfpjym ymj bjwprfs ufwkdy xjpnwqd;
Vm mfcl obzivuklz zjvslpfun ht P.]
Ckriusk znk yodzk, cngt zngz kbkxk nk yngr.
Hqt uqvjg, K yqn pcv mgrg og ejccuv kp cn.
Nwz awbpm, Q ewt vib smxm um kpiiab qv it.
Yus Ixoyzkt sgt yngr ckjjk sk gtut,
Hqt vjcppg vj' crquvng ugkvj vjcv K co htgg
Up xfeef, b Hpeeft ibmg, xifsf ju mjlfui nf.