Roman Catechism 24.40

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

Section 40. But to the carnal man, who is not yet freed from a servile spirit and who abstains from sin more through fear of punishment than love of virtue, (this sanction) of the divine law, which closes each of the Commandments, is burdensome and severe. Wherefore they should be encouraged by pious exhortation, and led by the hand, as it were, in the way of the law. The pastor, therefore, as often as he has occasion to explain any of the Commandments should keep this in view.