The helmet of salvation (as Paul stated in Ephesians 6:17) is one of the armour of God. A helmet is a protective head covering. It protects the brain from attacks. It is important to keep the head protected in battle just as a helmet can protect the head when riding a bike or motorcycle.
The brain holds all of our thoughts and emotions. It is the center of our mental and physical actions; it controls them. So when we have a helmet on, we are protecting ourselves from losing control of both mental and physical actions. In the spiritual sense, it is of utmost importance to protect our mind as it controls both the way we think and our actions. If we give in to the devil’s schemes, we allow him to control what we say and do.
So what is this helmet? It is the helmet of salvation. Salvation is what protects our minds. His salvation gives us the security we need to have peace and hope. It also gives us confidence to be able to talk to others about God.