You understand that the “foundation of this world” is built on the fear of death.
So, people who are trying to self-survive are living in this world’s system, which is designed to kill you. And Jesus says, “if you decide to lose your life” because you believe what He did, you’re dying for His sake because you believe Him. You don’t believe the lies of this world’s system that says, “You’ve got to protect yourself, you’ve got to step on your neighbor, you’ve got to have more money than the person next to you, so that you can feel safe and secure.”
This is only a small portion of the teaching, “What Is Life?“.