## sons of the day ##

This is an expression for believers in christ. AT: "believers in Christ" or "people of the light". (See [[rc://en/ta/man/translate/figs-idiom]])

## let us be sober ##

"let us exercise self-control"

## put on the breastplate of ##

As a soldier would put on a breastplate to protect his body, a believer who lives by faith and love will find protection.  AT: "protect ourselves with" (See: [[rc://en/ta/man/translate/figs-metaphor]])

## for a helmet ##

As a helmet protects a soldier's head so does assurance of salvation protect the believer.  AT: "and know" (See: [[rc://en/ta/man/translate/figs-metaphor]])

## but for the obtainment of salvation ##

"but to receive salvation"

## whether we are awake or asleep ##

"whether we are alive or dead" (See: [[rc://en/ta/man/translate/figs-euphemism]])

## build each other up ##

"encourage each other"