Catechism of the Catholic Church §2259 — excerpt
In the account of Abel's murder by his brother Cain, Scripture reveals the presence of anger and envy in man, consequences of original sin, from the beginning of human history.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.