Note 27 at 1 Th. 5:8: This is similar to the description of our armor listed in Ephesians 6:13-17. The same author wrote both these passages, so there is no doubt that Paul was alluding to this same illustration.

Here Paul mentions a breastplate of faith and love. In Ephesians, he calls it a breastplate of righteousness. This is appropriate since the only way we can obtain righteousness is through putting faith in the grace and love of God.

Isaiah also spoke of the Messiah putting on righteousness as a breastplate and a helmet of salvation upon his head (see Parallel Scripture for this v.).