Roman Catechism 19.131

Chapter 19 — Part II: The Sacraments — Penance

Section 131. Those Who Seek To Excuse Their Sins Should Be Corrected — The pride of some who seek by vain excuses to justify or extenuate their offences is carefully to be repressed. If, for instance, a penitent confesses that he was wrought up to anger, and immediately transfers the blame of the excitement to another, who, he complains, was the aggressor, he is to be reminded that such apologies are indications of a proud spirit, and of a man who either thinks lightly of, or is unacquainted with the enormity of his sin, while they serve rather to aggravate than to extenuate his guilt. He who thus labours to justify his conduct seems to say that then only will he exercise patience, when no one injures him -- a disposition than which nothing can be more unworthy of a Christian. Instead of lamenting the state of him who inflicted the injury he disregards the grievousness of the sin, and is angry with his brother. Having had an opportunity of honouring God by his exemplary patience, and of correcting a brother by his meekness, he turns the very means of salvation to his own destruction.