Roman Catechism 24.37

Chapter 24 — Part III: The Decalogue — The First Commandment

Section 37. In this concluding clause of this Commandment two things occur which demand careful exposition. The first is, that while, on account of the enormous guilt incurred by the violation of the first Commandment, and the propensity of man towards its violation, the punishment is properly indicated in this place, it is also attached to all the other Commandments.