Why are we to put on the whole armor of God? So that we will be able to take our stand against the enemy. Robert Gundy says that “standing represents resistance”. When we are strong in the Lord, and when we have put on the whole armor of God then and only then do we have the power to stand to resist the onslaught and the attack of the enemy of our souls.
There are two basic responses that we can choose when we find ourselves in the battle. The two responses are fight or flight. Unfortunately many people choose flight over fight. And why not if they are not prepared for the fight, if they find themselves unprotected. The second response is the road less traveled even for many Christians and that is to fight. The Christian who is strong in the Lord and who has put on the whole armor of God has no reason for flight and every reason to fight!
Now every sermon you’ve ever heard about the armor of God has probably made reference to the Roman soldier that Paul was chained to as his inspiration for what he wrote, though that may be partly true, but perhaps there was more to it.
The Old Testament prophet Isaiah wrote some verses that Paul may have had in mind as he wrote this passage. For instance we read in Isaiah 11:4-5
but with righteousness he shall judge the poor, and decide with equity for the meek of the earth; and he shall strike the earth with the rod of his mouth, and with the breath of his lips he shall kill the wicked. Righteousness shall be the belt of his waist, and faithfulness the belt of his loins.
Is. 11:4 – 5
Then in Isaiah 59:17 he wrote
He put on righteousness as a breastplate, and a helmet of salvation on his head; he put on garments of vengeance for clothing, and wrapped himself in zeal as a cloak.
Maybe the Holy Spirit used the image of the armor clad Roman soldier Paul was chained to to remind him of the words of the prophet Isaiah.