Paul also reminds the Colossians of their twofold security – they are hid in Christ and in God. His words remind us of Jesus’ twofold description of the safety of believers when he said that no-one could take his sheep out of his hand or out of his Father’s hand (John 10:28-29).
Who is it hidden from? It is hidden from physical opponents (remember that many Christians suffer martyrdom), but their attacks do not affect the real life of believers. It is hidden from their spiritual opponents: the devil cannot find it and therefore he is not able even to attempt to destroy it; death itself cannot find it and instead of being an attack by a ruthless antagonist death becomes the door through which believers enter into an higher form of spiritual life.
Where is it hidden? It is hidden in heaven, with the Father and the Son on the divine throne. Remember the picture in Revelation of the water of life flowing from the throne of God and of the Lamb. That is what and where our hidden life is. Our spiritual life comes from God and cannot be stifled. Although it is hidden, it flows to us because we are united to Christ. And so their life is secure.