16 And He saw that there was no man, and wondered that there was no intercessor: therefore His arm brought salvation unto Him; and His righteousness, it sustained Him.
17 For He put on righteousness as a breastplate, and an helmet of salvation upon His head; and He put on the garments of vengeance for clothing, and was clad with zeal as a cloak.
This is prophecy as yet unfulfilled. It refers to a much later time, when Antichrist controls with an iron fist. God looks down and is astonished that there was no one to defend the people. So God “puts on,” figuratively, His armor. The truth is that His own attributes are His armor against evil, and against Antichrist. It is interesting to compare the armor in these verses to that which Paul describes in Eph. 6:10-18, starting with the helmet of salvation.
God will deliver His people, and all believers, from the power of Antichrist; He will do so with His strength alone, against which no one nor anything can stand.