I Thessalonians 5:8

Faith, hope, and love, are the three pre-eminent graces (Th1 1:3; Co1 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" (Rom 4:3, Rom 4:22-24; Gal 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; Joh 5:24; Jo1 5:13); in another, it is a matter of "hope" (Rom 8:24-25). Our Head primarily wore the "breastplate of righteousness" and "helmet of salvation," that we might, by union with Him, receive both.

The apostle, having spoken in the end of the foregoing chapter concerning the resurrection, and the second coming of Christ, proceeds to speak concerning the uselessness of enquiring after the particular time of Christ's coming, which would be sudden and terrible to the wicked, but comfortable to the saints (Th1 5:1-5). He then exhorts them to the duties of watchfulness, sobriety, and the exercise of faith, love, and hope, as being suitable to their state (Th1 5:6-10). In the next words he exhorts them to several duties they owed to others, or to one another (Th1 5:11-15), afterwards to several other Christian duties of great importance (Th1 5:16-22), and then concludes this epistle (Th1 5:23-28).

5:8 Armor . . . helmet (Isa 59:17; Eph 6:11-17): The armament is the moral life (Rom 13:12; 2 Cor 6:7; 10:3-5; 2 Tim 2:3-4). The Christian soldier is equipped with the virtues of faith, love, and confidence (see 1 Thes 1:3; 3:6; 1 Cor 13:13; 2 Thes 1:3-4).