Helmet of Salvation

Full Eph 6:17, Isa 59:17, 1 Thess 5:8. The Roman galea (bronze/iron helmet). OT echo: Isa 59:17 (paired with the breastplate, the armor-of-YHWH passage). Paul redeploys the same image earlier and even shorter (1 Thess 5:8, "and for a helmet, the hope of salvation", ASV). Greek note: Paul's word for the "content" of this helmet, sōtērion (G4992, neuter), is the exact noun the Greek Old Testament (LXX) uses at Isa 59:17, Paul's helmet is tied to the Greek OT's own wording, not just its concept. Salvation as hope-framing-of-mind; the helmet protects the head; the hope of salvation protects the believer's perception of reality.