This is a command in Scripture, to not be anxious. But, it's not just a command, it's a command followed by a promise, "...and the peace of God which surpasses all understanding will guard your hearts and minds in Christ Jesus." This is the promise. But, what is a promise? According to dictionary.com it's "a declaration that something will or will not be done" or "an express assurance on which expectation is based." God promises us peace. It's a declaration that something will be done, an assurance on which something is based. And that something is the command to not be anxious. But, do we believe Him? Or is this simply another nicety that we glaze over in Scripture and placidly ignore? I pray not.
More of what Scripture has to say about anxiety..
"Therefore I tell you, do not be anxious about your life, what you will eat, what you will drink, nor about your body, what you will put on...But seek first the Kingdom of God and his righteousness and all these things will be added to you. Therefore do not be anxious about tomorrow, for tomorrow will be anxious for itself. Sufficient is the day is its own trouble."
Why are we so prone to anxiety? Is it in our nature? Does it originate from the fall, that left us literally crippled by our own insane desire to control, thus leaving us not trusting our God and creator, Lord and sustainer in whom all things hold together? What a sad state...
We don't have to remain in this state. Because He Jesus Christ came and died, saving us from this, our wretched state. "The old has passed away, behold the new has come." That's good news!
Although, the enemy would like us believe we are still bound by that old nature. He is indeed most cunning, seeking those who he might devour. Devour. That's intense. And we mustn't underestimate his evil ways and desires. BUT, we can take heart, because our Lord has overcome the world and has beaten sin and death-including satan and his evil minions. We've won! And we can live like it. We should live like it.
So, let's start living like sons and daughters of the most high King, ruler and sustainer of the universe, giver and taker of life, crusher of death, the Great I AM. He who has commanded us with a promise: "Do not be anxious about anything, but in everything my prayer and petition with thanksgiving make your requests known to God and the peace of God which surpasses all understanding will guard your hearts and minds in Christ Jesus." This is our assurance.
Let's start believing Him. And living like the redeemed, not like those who have no hope.