Roman Catechism 39.17

Chapter 39 — Part IV: Prayer — The Fifth Petition: Forgive Us Our Trespasses as We Forgive Those Who Trespass Against Us

Section 17. How great is the utility of this sort of instruction, which teaches us to grieve for our sins, God Himself declares by the mouth of Jeremias, who, when exhorting the Israelites to repentance, admonished them to awake to a sense of the evils that follow upon sin. See, he says, that it is an evil and a bitter thing for thee, to have left the Lord thy God, and that my fear is not with thee, saith the Lord, the God of hosts. They who lack this necessary sense of acknowledgment and grief, are said by the Prophets Isaias, Ezechiel and Zachary to have a hard heart, a stony heart, a heart of adamant, for, like stone, they are softened by no sorrow, having no sense of life, that is, of the salutary recognition (of their sinfulness).