As much as in you lieth (to ex humōn). Accusative of general reference, “so far as what proceeds from you” (“the from you part”). See to kat' eme in Rom 1:15. This phrase explains “if it be possible” (ei dunaton). “All your part is to be peace” (Alford). For “be at peace” (eirēneuontes) see 2Co 13:11.