The 1934 edition of the Psalter Hymnal published by the Christian Reformed Church contains a section of "Christian Prayers" in the liturgical part in the back. Two of those prayers relate to the preaching of the Heidelberg Catechism. Prof. B. Gritters referenced these in his first Interim course lecture last Friday (Jan.4).
In the previous post we quoted the first one; in this one we post the other. This one has the heading "Prayer After the Explanation of the Catechism." I believe you will find it to be thoroughly Reformed and biblical, and therefore, a prayer that is edifying and fit to be used ourselves.
And this is the prayer (slightly edited with paragraphs):
O gracious and merciful God and Father, we thank Thee that Thou hast established Thy covenant with believers and their seed. This Thou hast not only sealed by holy baptism, but Thou daily showest it by perfecting Thy praise out of the moth of babes and sucklings, thus putting to shame the wise and prudent of this world.
We beseech Thee that Thou wilt increase Thy grace in them, in order that they may unceasingly grow in Christ, Thy Son, until they have reached complete maturity in all wisdom and righteousness. Give us grace to instruct them in Thy knowledge and fear, according to Thy commandment.
May by their godliness the kingdom of Satan be destroyed and the kingdom of Jesus Christ in this and other congregations strengthened, unto the glory of Thy holy Name and unto their eternal salvation, through Jesus Christ, Thy Son and our Lord, who taught us to pray, saying,
Our Father who art in heaven, etc. Amen.