Eph 6:17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God;

Your brain is a marvelous creation.
It controls everything about your body from temperature and heart rhythm to processing odors and sounds.
In times of distress on the body, like hypothermia, the brain will tell the body to send more warming blood to the vital organs, including itself.
Your brain can feel a pinprick on your toe and alert you to pull away.
Cut off that toe and the brain will still function and control the rest of the body.
Remove an entire arm and the brain will continue to function and control the remainder of the body.
Cut off the head or damage the brain and the rest of the body will suffer.
This is why you must protect your brain and your thoughts with the helmet of salvation.
It says in Ps 119:41, Let Your mercies come also to me, O Lord — Your salvation according to Your word.
Salvation is by the word of God and the helmet of salvation is the word of God.
Protect your thoughts by reading the word of God and filter out the lies of the world that go against it.
Now on to the final part of the armor – the sword.
Hebrews tells you the word of God is living and powerful, and sharper than any two-edged sword.
Again, the sword is the word of God.
This is your only weapon and what do you do with it?
Hold it.
In this chapter of Ephesians, you are instructed to stand (Eph 6:11, 13, 14).
You are not to swing or sway.
You are to stand in the word of God.
The word of God does the fighting for you.
Stand on His word.
Stand in His word.