Wherefore take up the entire amour of God, that ye may be able to withstand in the evil day. Some have tried to affix a specific time to the "evil day" of the apostle, as if it were one or other of the days specified in the Apocalypse; but more probably it is a general phrase, like "the day of adversity," or "the day of battle," indicating a day that comes often.
In fact, any day when the evil one comes upon us in force is the evil day, and our ignorance of the time when such assault may be made is what makes it so necessary for us to be watchful. And having done all, to stand.
"Having done fully," or "completed," is the literal import of κατεργασάμενοι, having reference, not only to the preparation for the battle, but to the fighting too. The command to be "strong in the Lord" is fitly associated with our "having done all," because leaning on almighty strength implies the effort to put forth strength by our own instrumentality; when God's strength comes to us it constrains us "to do all" that can be done by us or through us (comp.
Psalms 144:1; Philippians 2:12, Philippians 2:13). We are not called to do merely as well as our neighbors; nor even to do well on the whole, but to do all—to leave nothing undone that can contribute to the success of the battle; then we shall be able to stand, or stand firm.