In one sense, it seems appropriate that we focus more explicitly on the Father and the Son when discussing the Trinity. The Spirit does not point to himself but rather illumines, pours out the essence of the Father and the Son through the Word and into our hearts.
And yet, perhaps we aren't thankful enough for the power and presence of the Holy Spirit in our lives as believers. Right now the Father and the Son are invisible to us, and we must depend explicitly on the Spirit to reveal them through the Word. Recently, Revelation's pictures of the Holy Spirit have invaded my imagination: those seven torches of fire before the heavenly throne (Rev. 4:5), and the slain Lamb's seven eyes, "which are the seven spirits of God sent out into all the earth" (Rev. 5:6). These pictures communicate a live, potent, brilliant presence of God, emanating directly from the throne of God and of the Lamb.
So when we read, for example, in the book of Ephesians that we are sealed with this Spirit, that according to the riches of God's glory the Father strengthens us with power through his Spirit in our inner being, that Christ actually dwells in our hearts through faith, that we may indeed by God's grace be filled with all the fullness of God . . . when we read these things, we should perhaps marvel more at the gift of the Holy Spirit, with his fire and his eyes, who actually comes to live in us.
No Longer Alone, No Longer Impotent
One specific outworking of more conscious marveling at the Holy Spirit might involve our understanding of sanctification. The whole current debate on justification and sanctification is so crucial and so complicated. John Piper and Tim Keller's recent discussion is helpful and clarifying. I find myself needing to get straight again and again both the truth of Christ's utterly sufficient work of justification on my behalf, and the truth of Scripture's call for my sword-wielding, hard-working, putting-off-and-putting-on progress in holiness. Thanking God for the Holy Spirit is helping me to hold those truths together in my mind and heart. The Spirit is the one who accomplishes in us the washing of regeneration and renewal, this Spirit whom God "poured out on us richly through Jesus Christ our Savior" (Titus 3:5-6).
As a believer, the "I" called to work hard in the process of sanctification is an "I" no longer the same, no longer alone, no longer impotent. God has poured out in us the gift that not only motivates us but also empowers us in our sanctification. I don't need to be afraid to say I must work out my salvation with fear and trembling, for indeed it is God who works in me (Phil. 2:12). He does that through the powerful presence of his Holy Spirit, promised by Jesus to his disciples before he died, and delivered to his people after his resurrection. How wonderful is the fullness of seven torches and seven eyes: no one of us in the body of Christ is alone in receiving this gift or in living out its power.
As the Spirit applies the living and active Word to our new hearts, we grow into the likeness of Christ---of course not perfectly until the end, when we will see him face to face. In the meantime, I suppose there's no other way for us to keep truths like justification and sanctification together than for all of us to keep reading and studying all of Scripture, all of it, again and again---for the Word keeps telling us and telling us about Christ's work of justification for us and the working out of holiness that follows. Thank God for the Holy Spirit through whom God pours himself out to make all of this happen.