and take the helmet of salvation, and the sword of the Spirit, which is the word of God, (ESV)
We are going to look at the helmet of salvation today. As we begin we need to remember who the Apostle Paul is writing to. This is a letter to the saints at Ephesus. These are believers in Jesus Christ. So, as we look at this helmet of salvation that we are to use as spiritual armor we recognize that this is not a magical helmet that gives us salvation. Rather, it is used to protect our understanding of our salvation.
Now, how would our understanding of our salvation be under attack? Satan wants to attack the assurance of our salvation. If he can have us doubting who we belong to he can make us weak and ineffective in the battle. The head is one of the most strategic parts of a body to attack. Satan is not unaware of this. I believe that we need to spend far more time making sure that are thinking is sound so as to be protected from the doubts that are fired at us continually by the Enemy.
Dr. John MacArthur writes:
"Although a Christian’s feelings about his salvation may be seriously damaged by Satan-inspired doubt, his salvation itself is eternally protected and he need not fear its loss. Satan wants to curse the believer with doubts, but the Christian can be strong in God’s promises of eternal salvation in Scripture."
- Dr. John MacArthur, Study Bible Notes
I would highly recommend that you do a search of all the verses that speak of salvation. Read them. Meditate on them. Allow the truth of God's Word assuage any doubt that is plaguing you.