I rolled up my sleeve and looked away. The injection of immunoglobulin was going to sting, and I knew it. I knew, however, that it could prevent a battle with Hepatitis A. One of my family members had been exposed to the highly contagious disease—which karate- kicks the liver—and health authorities had recommended vaccinations for everyone in my household.

There’s an emotional ailment that can also be quite “catchy.” Fear. Moses advised his military leaders to take a pre-battle poll of the troops and ask, “Is anyone here afraid or worried?” (Deuteronomy 20:8). Soldiers who admitted their anxiety were discharged before they could scare off anyone else. The commanders wanted to prevent the panic of a few from contaminating the entire army.

When we advertise and live out our fear, it can spread to others. Parents pass phobias on to children. Friends infect other friends with superstitions. Employees alarm their co-workers when the fate of the company is in question. Fortunately, there’s a way to stop the spread of panic.

Moses prescribed this message for fearful soldiers: “Do not be afraid as you go out to fight your enemies today! Do not lose heart or panic or tremble before them!” (Deuteronomy 20:3). In other words, Be brave. Stand tall. Don’t back down, because “the Lord your God is going with you! He will fight for you . . . and He will give you victory!” (Deuteronomy 20:4).

The promise of God’s presence wasn’t just for the Israelites. He’s with us too, even today (Matthew 28:20). Because of that, we can say, “I know the Lord is always with me. I will not be shaken, for He is right beside me” (Psalm 16:8). When we put this into practice, fear will lose its foothold in our lives. Friends and family may start to notice. For courage is contagious too.

NLT 365-day reading plan passage for today: Psalm 139:1-24