Imagine never worrying about anything! It seems like an impossibility - we all have worries on the job, in our homes, at school. But Paul's advice is to turn our worries into prayers. Do you want to worry less? Then pray more! Whenever you start to worry, stop and pray.
God's peace is different from the world's peace (see John 14:27). It is not found in positive thinking, in absence of conflict, or in good feelings. Real peace comes from knowing that because God is in control, our citizenship in Christ's kingdom is sure, our destiny is set, and our victory over sin is certain. Let God's peace defend your heart against worry.