And you also were included in Christ when you heard the message of truth, the gospel of your salvation. When you believed, you were marked in him with a seal, the promised Holy Spirit, who is a deposit guaranteeing our inheritance until the redemption of those who are God's possession—to the praise of his glory (Ephesians 1:13-14).
It appears easier for us Christians to speak about God the Father and God the Son then about God the Holy Spirit. Somehow, the concrete actions of God as Creator and God as Redeemer are easier for us to get our minds around than God the Sanctifier. Mind you, the creating and redeeming actions of God are mind blowing enough. But exactly who the Spirit is and what the Spirit does seems to allude consensus among Christians. When we pray, we generally address God the Father or God the Son, but not so often, God the Holy Spirit.
Part of the praying thing is that we rightly follow Jesus' instruction to address God as Father. I suspect that the lack of clarity regarding the Holy Spirit is mostly due to poor preaching, at least for the branch of the church I am most familiar with. Strangely, our confessions give us a rather clear picture of the Spirit's work.
Consider these examples. First, from the Heidelberg Catechism:
"Because I belong to him, Christ, by his Holy Spirit, assures me of eternal life and makes me wholeheartedly willing and ready from now on to live for him" (A1).
It includes this prayer, "We are too weak to hold our own even for a moment. And our sworn enemies-the devil, the world, and our own flesh-never stop attacking us. And so, Lord, uphold us and make us strong with the strength of your Holy Spirit, so that we may not go down to defeat in this spiritual struggle, but may firmly resist our enemies until we finally win the complete victory (A127).
"Through the Holy Spirit, who lives both in Christ and in us, we are united more and more to Christ's blessed body. And so, although he is in heaven and we are on earth, we are flesh of his flesh and bone of his bone. And we forever live on and are governed by one Spirit, as members of our body are by one soul" (A76).
The Belgic Confession summarizes this rather bluntly, "The Holy Spirit is our Sanctifier, by living in our hearts" (BC 9).
The Contemporary Testimony elaborates, "The Spirit renews our hearts and moves us to faith, leads us into truth, and helps us to pray, stands by us in our need, and makes our obedience fresh and vibrant. God the Spirit lavishes gifts on the church in astonishing variety-prophecy, encouragement, healing, teaching, service, tongues, discernment-equipping each member to build up the body of Christ and to serve our neighbors" (20).
Back to the Heidelberg Catechism, it says that Jesus "sends his Spirit to us on earth as a further guarantee. By the Spirit's power we make the goal of our lives, not earthly things, but the things above where Christ is, sitting at God's right hand" (A49).
These confessions, both ancient and modern, all agree, the Christian life is only lived by the power of the Spirit. Any and all progress we make in the journey of discipleship does not happen without the Holy Spirit. As we mature in the Christian life, our desires are drawn away from the things of this world and focussed on Christ. The Holy Spirit is so intricately involved in the Christian life, how can we neglect him?
In our text Paul writes that the Spirit is a deposit guaranteeing the completion of our redemption. He does not mean that the Holy Spirit is present at our conversion and then returns to wrap things up. Its more akin to mortgage payments. The Holy Spirit is constantly present to work redemption into our lives, 'to unite us more and more to Christ's body.'
Let us live with confidence that the good work which God began in us, the Holy Spirit will see to its conclusion.