NET Bible Eph 6:15 by fitting your feet with the preparation that comes from the good news of peace,
What is Paul comparing to footwear? Preparation? What kind of preparation comes from the gospel? And why does he call it "the gospel of peace"?
Paul's weaponry appears to be intended to fight against cosmic evil forces. In what way does one "prepare" the "peace gospel" for such a conflict?
BDAG points to several authors who suggest that "preparation" should instead read "equipment" (ie: military boots):
ἑτοιμασία, ας, ἡ (s. next entry; Hippocr.; BGU 625, 17; PHerm 95, 20; LXX) readiness, preparation (so Hippocr., Decent. 12 vol. IX 240 L.; Ps 9:38; EpArist 182; Jos., Ant. 10, 9 v.l.) τοῦ εὐαγγελίου τῆς εἰρήνης for the gospel of peace Eph 6:15. The mng. equipment (here specif. ‘boots’), as in Mod. Gk., is favored by ABuscarlet, ET 9, 1897/98, 38f; EBlakeney, ET 55, ’43/44, 138; JGregg, ET 56, ’44, 54; L-S-J-M. W. ἄσκησις MPol 18:3.—M-M. TW.
Arndt, W., Danker, F. W., Bauer, W., & Gingrich, F. W. (2000). A Greek-English lexicon of the New Testament and other early Christian literature (3rd ed., p. 401). Chicago: University of Chicago Press.
If so, how is the "gospel of peace" like boots?
Below is an image of an actual Roman marching boot from 2000 years ago!