John Calvin on Ephesians 6:13

13. Wherefore take unto you. Though our enemy is so powerful, Paul does not infer that we must throw away our spears, but that we must prepare our minds for the battle. A promise of victory is, indeed, involved in the exhortation, that ye may be able. If we only put on the whole armor of God, and fight valiantly to the end, we shall certainly stand. On any other supposition, we would be discouraged by the number and variety of the contests; and therefore he adds, in the evil day. By this expression he rouses them from security, bids them prepare themselves for hard, painful, and dangerous conflicts, and, at the same time, animates them with the hope of victory; for amidst the greatest dangers they will be safe. And having done all. They are thus directed to cherish confidence through the whole course of life. There will be no danger which may not be successfully met by the power of God; nor will any who, with this assistance, fight against Satan, fail in the day of battle.

Ephesians 6:14-20

14. Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;

14. State igitur succincti lumbos veritate, et induti thoracem justitiae,

15. And your feet shod with the preparation of the gospel of peace;

15. Et calceati pedes praeparatione evangelii pacis;

16. Above all, taking the shield of faith, wherewith ye shall be able to quench all the fiery darts of the wicked.

16. In omnibus assumpto scuto fidei, quo possitis omnia tela maligni ignita exstinguere.

17. And take the helmet of salvation, and the sword of the Spirit, which is the word of God:

17. Et galeam salutaris accipite, et gladium Spiritus, qui est verbum Dei;

18. Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;

18. Per omnem precationem et orationem omni tempore precantes in Spiritu, et in hoc ipsum vigilantes, cum omni assiduitate et deprecatione pro omnibus sanctis;

19. And for me, that utterance may be given unto me, that I may open my mouth boldly, to make known the mystery of the gospel,

19. Et pro me, ut mihi detur sermo in apertione oris mei cum fiducia, ut patefaciam mysterium evangelii;

20. For which I am an ambassador in bonds; that therein I may speak boldly, as I ought to speak.

20. Pro quo legatione fungor in catena; ut confidenter me geram in eo, quemadmodum oportet me loqui.