Ephesians 6:17 KJV — And take the helmet of salvation, and the sword of the Spirit, which is the word of God:
The helmet covers your head, which is the location of your brain, the centre of your thinking.
The helmet is the context within which a solider thinks on the battlefield. As long as they’re engaged in battle, they don’t get to take off that helmet.
We are engaged in battle.
And so all our thoughts about everything are to occur within the context of salvation…your new life in Christ.
Any thought that would separate you from that context – i.e to have you remove your head from the protection of your helmet – is a wile of the enemy.
Every thought happens within the context of salvation.
Keep your head within your helmet.