In Isa. 52:7 and Rom. 10:15 the “feet” and the proclamation of the “gospel of peace” are closely linked, suggesting action, the bearing of the message of good news. In this verse, however, the idea seems to be that of steadfastness in the Christian warfare. Hence the gospel, in this instance, is not so much the gospel to be proclaimed, but the gospel that has found lodgment in the heart of the Christian. It is a beautiful and encouraging thought that the warrior in the midst of spiritual conflict can stand firm in peace. He has peace with God (Rom. 5:1). Essentially, the gospel is the good news that men need not die, and that is a welcome word to the warrior facing relentless foes. He stands firm on the knowledge of Christ incarnate, crucified, risen, ascended—the heart of the gospel, and the reason for peace.

 Or, “preparedness.” In Paul’s figure the sandals apparently served to enable the wearer to stand firm rather than to run. The picture is therefore not parallel with that in Isa. 52:7.

The legs of the Roman soldier were covered by greaves, with sandals on the feet. This was necessary in order that his movements over rough ground should not be impeded. If he was to be able to stand the assault, he must have a sure footing.