Albert Barnes Commentary Ephesians 6:13

"Wherefore take up the whole armor of God, that ye may be able to withstand in the evil day, and, having done all, to stand." — Ephesians 6:13 (ASV)

In the evil day. The day of temptation; the day when you are violently assaulted.

And having done all, to stand. The margin reads, "or overcome." The Greek word means to work out, effect, or produce; and then to work up, to make an end of, or to vanquish (Robinson, Lexicon).

The idea seems to be that they were to overcome or vanquish all their enemies, and thus to stand firm. The whole language here is taken from war; and the idea is that every enemy was to be subdued—no matter how numerous or formidable they might be. Safety and triumph could be looked for only when every enemy was slain.