Having warned us not to be full of worry, Paul told us how we can be free of cares and anxiety. By praying to God in supplication based on what He promised us, and being thankful for what He already did for us in Christ, we will not be full of cares and fears. The reason for this is what Paul wrote in Philippians 4:7 , namely, "And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus."
Here we have the opposite of being filled with cares. When we have cares, and then flee to God in prayer, He will work peace in our hearts and minds. Such peace is the state wherein heart and mind have no cares or worries. It is that state wherein we are sure that God has only peaceful thoughts towards us, because of what He did for us through Christ Jesus. We may have disappointments, and even be persecuted with physical torment. But in all this God is not fighting us. We have peace with Him through Christ, and, knowing that, we have peace in our hearts and minds as His gift to us.
Then we have a peace that passeth all understanding. For who can understand that God gave His own Son to the agonies of hell to save sinners who hated Him, and by their evil natures are fighting against Him? Who can understand that God gave His Son for the salvation of those that hated Him?
And now that God has done this for us, is there any reason to worry about what He is going to do to us and for us? Can we question His love for us, when He made such a sacrifice for us? Can we question His love, when He gave us His most precious possession?
No, the perfect peace between the three Persons in the Holy Trinity, that gave us such a precious gift, assures us that there is peace between Him and us. And although we do not always understand what He decreed in our lives, and what happens to us in this vale of tears, we do not doubt His peaceful thoughts toward us.
Be sure that all things work together for our good.
Read: Psalm 3 .
"As long as this duty (catechizing) was faithfully performed by parents, the darkness of ignorance and idolatry were prevented, but as soon as it fell into neglect, error and vice must have been the consequence. ...And what upon earth is so worthy of time and pains as the knowledge of God's Word, and the doctrines of his wonderful love and grace?" A. Alexander