{3} But let us, who are of the day, be sober, putting on the breastplate of faith and love; and for an helmet, the hope of salvation.

(3) We must fight with faith and hope, and therefore we should certainly not lie snoring.

People's New Testament

5:8 Putting on the breastplate of faith and love. The exhortation to the soldierly duties of watchfulness and sobriety suggests the thought of a sentinel and his armor. Compare Eph 6:11,14. There the shield of faith is spoken of; here the breastplate. Both were for the defense of the body. Nothing will better protect the heart from evil thoughts and keep us watching than faith and love.

For an helmet, the hope of salvation. See PNT Eph 6:17. What a power to protect, a blessed hope of salvation through Christ.

Scofield Reference Notes

Margin salvation

See Scofield Note: "Rom 1:16".

Jamieson-Fausset-Brown Bible Commentary

8. Faith, hope, and love, are the three pre-eminent graces (1Th 1:3; 1Co 13:13). We must not only be awake and sober, but also armed; not only watchful, but also guarded. The armor here is only defensive; in Eph 6:13-17, also offensive. Here, therefore, the reference is to the Christian means of being guarded against being surprised by the day of the Lord as a thief in the night. The helmet and breastplate defend the two vital parts, the head and the heart respectively. "With head and heart right, the whole man is right" [Edmunds]. The head needs to be kept from error, the heart from sin. For "the breastplate of righteousness," Eph 6:14, we have here "the breastplate of faith and love"; for the righteousness which is imputed to man for justification, is "faith working by love" (Ro 4:3, 22-24; Ga 5:6). "Faith," as the motive within, and "love," exhibited in outward acts, constitute the perfection of righteousness. In Eph 6:17 the helmet is "salvation"; here, "the hope of salvation." In one aspect "salvation" is a present possession (Joh 3:36; 5:24; 1Jo 5:13); in another, it is a matter of "hope" (Ro 8:24, 25). Our Head primarily wore the "breastplate of righteousness" and "helmet of salvation," that we might, by union with Him, receive both.

Matthew Henry's Concise Commentary

5:6-11 Most of mankind do not consider the things of another world at all, because they are asleep; or they do not consider them aright, because they sleep and dream. Our moderation as to all earthly things should be known to all men. Shall Christians, who have the light of the blessed gospel shining in their faces, be careless about their souls, and unmindful of another world? We need the spiritual armour, or the three Christian graces, faith, love, and hope. Faith; if we believe that the eye of God is always upon us, that there is another world to prepare for, we shall see reason to watch and be sober. True and fervent love to God, and the things of God, will keep us watchful and sober. If we have hope of salvation, let us take heed of any thing that would shake our trust in the Lord. We have ground on which to build unshaken hope, when we consider, that salvation is by our Lord Jesus Christ, who died for us, to atone for our sins and to ransom our souls. We should join in prayer and praise one with another. We should set a good example one before another, and this is the best means to answer the end of society. Thus we shall learn how to live to Him, with whom we hope to live for ever.