Planning a menu and then going out and buying the necessary food is an activity that will accomplish something useful. Worry is useless. Concern is helpful. He tells us what to do. If there is anything you need, pray for it, and that peace of God which is so much greater than we can understand will guard your hearts and your thoughts.
Peace is pictured like an armed guard who is standing outside our mind and heart.
If anything tries to get in to disturb us, peace blocks the way. Our hearts are kept undisturbed even though there are storms all around us. And because we have that inner peace, we can make much better decisions as how to handle those storms. I live better by faith and confidence than by fear and anxiety. In worry and anxiety, we grasp for breath, but with faith and confidence, we breathe freely.