εν preposition
en  en: in, at, (up-)on, by, etc.
σαρκι noun - dative singular feminine
sarx  sarx: carnal(-ly, + -ly minded), flesh(-ly).
γαρ conjunction
gar  gar: assigning a reason (used in argument, explanation or intensification; often with other particles)
περιπατουντες verb - present active passive - nominative plural masculine
peripateo  per-ee-pat-eh'-o: to tread all around, i.e. walk at large (especially as proof of ability); figuratively, to live, deport oneself, follow (as a companion or votary) -- go, be occupied with, walk (about).
ου particle - nominative
ou  oo: no or not -- + long, nay, neither, never, no (man), none, (can-)not, + nothing, + special, un(-worthy), when, + without, + yet but.
κατα preposition
kata  kat-ah': (prepositionally) down (in place or time), in varied relations
σαρκα noun - accusative singular feminine
sarx  sarx: carnal(-ly, + -ly minded), flesh(-ly).
στρατευομεθα verb - present middle indicative - first person
strateuomai  strat-yoo'-om-ahee: to serve in a military campaign; figuratively, to execute the apostolate (with its arduous duties and functions), to contend with carnal inclinations -- soldier, (go to) war(-fare).