CCC 1493
Christian Mystery›SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH›CHAPTER TWO THE SACRAMENTS OF HEALING›IN BRIEF
One who desires to obtain reconciliation with God and with the Church, must confess to a priest all the unconfessed grave sins he remembers after having carefully examined his conscience. the confession of venial faults, without being necessary in itself, is nevertheless strongly recommended by the Church.