In Brief CCC 415
© Libreria Editrice Vaticana Source: vatican.va
"Although set by God in a state of rectitude man, enticed by the evil one, abused his freedom at the very start of history. He lifted himself up against God, and sought to attain his goal apart from him" (GS 13 # 1).
Read the full chapter 1. I Believe in God the Father ¶198–421