Charles Ellicott Commentary 1 Thessalonians 5:8

"But let us, since we are of the day, be sober, putting on the breastplate of faith and love; and for a helmet, the hope of salvation." — 1 Thessalonians 5:8 (ASV)

Putting on.—A curiously abrupt transition, suggested by the sober vigilance just advocated. The Christian must be careful to watch, not only because the Lord is coming back at some unexpected hour, but also because there are enemies all around. He is not only the porter, sitting up to let his Lord in at any hour when He may return from the wedding (Mark 13:34; Luke 12:36), but the soldier standing sentry, liable to be surprised by the enemy.

Breastplate of faith and love.—We are not dealing with the Christian soldier as aggressive and going out to conquer, which idea is developed in Ephesians 6:11 and following, but only as defensive, and protected in breast and head against sudden blows. The three “theological virtues” are the Christian’s defense (Compare to 1 Thessalonians 1:3; 1 Corinthians 13:13).

The “breastplate” is a cuirass fitting close to the body, and in Ephesians this cuirass is composed of righteousness, while faith becomes the shield, and love disappears from the panoply. The “faith” here is a general trust in God’s presence and goodness; the “love” is the love both of God and of people.

Perhaps it is unnecessary to inquire particularly why faith and love are represented as covering the body, and hope as covering the head. It seems far-fetched to consider the first two as keeping the heart, that is, the affections, from injury; the third as preserving the brain, that is, keeping us from miscalculating the dangers and so falling into despair.

In the passage of Isaiah which St. Paul here imitates, the “helmet of salvation” appears to mean little more than a helmet which secures safety. However, as one of the chief benefits which such armor confers is the confident hope of emerging unhurt, St. Paul fairly describes that hope itself as being a protection. In the forefront of the lost (Revelation 21:8) stand those who have had no “hope” or “trust.”