en_tn/eph/06/13.md

Therefore put on the whole armor of God

Christians should use the protective resources God gives them in fighting the devil in the same way a soldier puts on armor to protect himself against his enemies. (See: rc://en/ta/man/jit/figs-metaphor)

so that you may be able to stand ... to stand firm

The words "stand" and "stand firm" represent successfully resisting or fighting something. Alternate translation: "so that you may be able to resist evil ... to remain strong" (See: rc://en/ta/man/jit/figs-metaphor)

in the evil day

Here the word "day" can refer to any short period of time, even a period longer than a day. Alternate translation: "at the evil time" or "when people do evil deeds" (See: rc://en/ta/man/jit/figs-synecdoche)