If you struggle with what to say when you stop long enough to talk with God about things you are experiencing anxiety about, you are probably among a huge group of others who experience similar anxious thoughts. Anxiety has become one of the biggest issues today simply because of all the uncertainty in the world around us. Supply chain issues, rising interest rates, difficulty finding jobs that pay enough to make ends meet, unrest over one's beliefs, and the list goes on. For some, these things can become overwhelmingly difficult to deal with. The desire is to have God take it all away, but the reality is that God primarily helps us walk through those difficulties rather than removing them completely.
The most important part of this passage is something we all need to hear: "HIS peace can..." It stands guard over our thoughts. It keeps our emotions in check. In other words, HIS peace brings the checks and balances into our lives that keep us on an even keel. God's peace can do this BETTER than anything our human minds can accomplish with all that worrying and fretting. Some of us are habitual worriers - we aren't even sure what causes all the worrying, or that we are even engaging in worry, but those anxious thoughts just creep to the surface so easily. When there is so much worry, there is little room for peace. That's why God tells us to cast those cares upon him. Bring them to the surface, being direct in admitting they are there, even when we don't actually know the cause of those worries. Then he does the rest!
The thing we might miss in this passage - it is HIS peace that stands guard over our minds and our hearts. Both are affected so deeply by anxiety. Emotions ride high one day, low the next, all jumbled up at times that we cannot even explain what we are feeling or where those thoughts are coming from. Our minds ruminate on things that we should never have entertained in the first place. At other times, there is genuine concern for a situation, but we don't bring it to God, choosing to just rehearse it over and over again in our minds until our emotions are in a jumbled mess. The thing we need to ask God is to place a guard over our hearts and minds. When we are tempted to 'own the worry', we need to stop, remind ourselves that God has placed that guard there because he can bring peace far better than any human reasoning can ever provide. Just sayin!