And take the helmet of salvation. This is the head-covering (comp. Psalms 140:7). In 1 Thessalonians 5:8 we read, "putting on for an helmet the hope of salvation." The glorious truth that we are saved (comp.
Ephesians 2:5, Ephesians 2:8) appropriated, rested on, rejoiced in, will protect even so vital a part as the head, will keep us from intellectual surrender and rationalistic doubt. And the sword of the Spirit, which is the Word of God.
The sword supplied by the Spirit, the Word being inspired by him, and employed by the Spirit; for he enlightens us to know it, applies it to us, and teaches us to use it both defensively and offensively.
Our Lord in his conflict with Satan, and also with the scribes and Pharisees, has taught us how this weapon is to be used, and with what wonderful effect. Paul, too, reasoning from the Scriptures and proving from them "that this Jesus whom I preach unto you is the Christ," or (going back to the Old Testament) the author of the hundred and nineteenth psalm, showing us how the soul is to be fed, quickened, strengthened and comforted out of God's Law, indicates the manifold use of the sword, and shows how earnestly we should study and practice this sword exercise, for our own good and the good of others.