Ursinus on the Structure of the Catechism

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 deliverance 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.

Zacharias Ursinus (1534–83) from his Body of Orthodox Doctrine or Explanation of the Catechism.