The Westminster Shorter Catechism concludes with a very helpful section dealing with the outward and ordinary means of grace (Q.88-107). The means of grace are the “ordinances” of Christ, “especially the Word, sacraments, and prayer” (Q.88). That is basically an outline of the contents of the remainder of the catechism. It deals with the Word in Q.89-90; the sacraments in Q.91-97; and prayer in Q.98-107 (which is more or less an exposition of the Lord’s Prayer).
How is the Word of God a means of grace? The Shorter Catechism says the following:
Q. 89. How is the Word made effectual to salvation? A. The Spirit of God makes the reading, but especially the preaching, of the Word, an effectual means of convincing and converting sinners, and of building them up in holiness and comfort, through faith, unto salvation.
The Holy Spirit working through the Word of God makes it a means of grace. That is, He makes the Word effectual for “the convincing and converting sinners” (bringing them to faith in Christ at the beginning), and of “building them up in holiness and comfort” (ongoing throughout the Christian life), “through faith” (because the Christian life is by faith from beginning to end – Romans 1:17). So in a lot of ways, that means the Word of God is central in the Christian life.
But notice that the catechism specifies that it is “especially the preaching” of the Word that the Holy Spirit makes effectual unto the salvation of sinners. Do we have such a high view of the preaching of the Word on the Lord’s day? Do we believe that it is not just one means among many of evangelizing the lost and bringing them to repentance and faith in Christ, but actually the primary means that God uses to do so? Perhaps if we rightly understood the primacy of preaching in evangelism, we might be much more enthusiastic about inviting our friends and neighbors to church.
And what of the Christian life, and sanctification? According to the Catechism (and Scripture, of course – see 2 Timothy 3:16-4:2), the preaching of the Word takes preeminence there as well (or at least it should). Can you live the Christian life and grow in grace the way that you should apart from diligently attending upon the preaching of the Word of God? Simply put – no. Private reading and study of the Scriptures is certainly necessary and helpful, but that is no substitute for the preached Word.