The helmet is called the hope of salvation. The initial salvation we receive isn’t enough, once saved, we need to grow in Christ. Love Jesus by walking in his commandments daily.
No more citizens of the earth, we long for the final day of salvation when Jesus comes to take His Bride.
Our identity needs to be protected, lest Satan beguile us and lead us away into temptation. The Christian walk is, love in action. We love what God loves, and hate what God hates.. The enemy, Satan, is constantly trying to steal from our minds our very identity so he can confuse and destroy us.
Keep that helmet on!