What is Catechism? 3III. What Are the Parts or Principal Heads of the Doctrine of Catechism?

The chief and most important parts of the first principles of the doctrine of the church, as appears from the passage just quoted from the Epistle to the Hebrews, are repentance and faith in Christ, which we may regard as synonymous with the law and gospel. Hence, the catechism in its primary and most general sense, may be divided as the doctrine of the church, into the law and gospel. It does not differ from the doctrine of the church as it respects the subject and matter of which it treats, but only in the form and manner in which these things are presented, just as strong meat designed for adults, to which the doctrine of the church may be compared, does not differ in essence from the milk and meat prepared for children, to which the catechism is compared by Paul in the passage already referred to. These two parts are termed, by the great mass of men, the Decalogue and the Apostles' creed; because the Decalogue comprehends the substance of the law, and the Apostles' creed that of the gospel. Another distinction made by this same class of persons is that of the doctrine of faith and works, or the doctrine of those things which are to be believed and those which are to be done.

There are others who divide the catechism into these three parts; considering, in the first place, the doctrine respecting God, then the doctrine respecting his will, and lastly that respecting his works, which they distinguish as the works of creation, preservation, and redemption. But all these different parts are treated of either in the law or the gospel, or in both, so that this division may easily be reduced to the former.

There are others, again, who make the catechism consist of five different parts; the Decalogue, the Apostles' Creed, Baptism, the Lord's Supper, and Prayer; of which, the Decalogue was delivered immediately by God himself, whilst the other parts were delivered mediately, either through the manifestation of the Son of God in the flesh, as is true of the Lord's Prayer, Baptism, and the Eucharist, or through the ministry of the apostles, as is true of the Apostles' Creed. But all these different parts may also be reduced to the two general heads noticed in the first division. The Decalogue contains the substance of the law, the Apostles' Creed that of the gospel; the sacraments are parts of the gospel, and may, therefore, be embraced in it as far as they are seals of the grace which it promises, but as far as they are testimonies of our obedience to God, they have the nature of sacrifices and pertain to the law, whilst prayer, in like manner, may be referred to the law, being a part of the worship of God.

The catechism of which we shall speak in these lectures consists of three parts. The first treats of the misery of man, the second of his deliverance from this misery, and the third of gratitude, which division does not, in reality, differ from the above, because all the parts which are there specified are embraced in these three general heads. The Decalogue belongs to the first part, in as far as it is the mirror through which we are brought to see ourselves, and thus led to a knowledge of our sins and misery, and to the third part in as far as it is the rule of true thankfulness and of a Christian life. The Apostles' Creed is embraced in the second part inasmuch as it unfolds the way of deliverence from sins. The sacraments, belonging to the doctrine of faith and being the seals that are attached thereto, belong in like manner to this second part of the catechism, which treats of deliverance from the misery of man. And prayer, being the chief part of spiritual worship and of thankfulness, may, with great propriety, be referred to the third general part.