Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand.
Wherefore - since we have such formidable foes.
Take ... of God - not 'make;' God has done that: you have only to 'take up' х analabete (G353)] and put it on. The Ephesians had myths of gods giving armour to heroes: thus Paul's allusion is appropriate.
The evil day - the day of Satan's special assaults (Ephesians 6:12; Ephesians 6:16; Ephesians 5:16), and at the dying hour (cf. Revelation 3:10). Our armour must always be on, to be ready against "the evil day" of especial temptation, which may come at any moment, the war being perpetual (Psalms 41:1, margin).
Done all, х hapanta (G537) katergasamenoi (G2716)] - 'accomplished all things;' namely necessary to the fight, and becoming a good soldier.
Stand. The repetition in Ephesians 6:11; Ephesians 6:14 shows that standing - i:e., maintaining our ground during the life-long battle, not yielding or fleeing-is the grand aim.