Confession In The Catholic Church Today (Updated 2021) :
“You shall confess your sins (to a Priest) at least once a year” (2042).
“Christ instituted the sacrament of Penance [confession] for all sinful members of His
Church: above all for those who, since Baptism, have fallen into grave sin, and have thus
lost their baptismal grace and wounded ecclesial communion. It is to them that the
sacrament of Penance offers a new possibility to convert and to recover the grace of
justification. The Fathers of the Church present this sacrament as ‘the second plank [of
salvation] after the shipwreck which is the loss of grace’” (1446).
“All mortal sins of which penitents after a diligent self-examination are conscious must be
recounted by them in confession, even if they are most secret and have been committed
against the last two precepts of the Decalogue; for these sins sometimes wound the soul
more grievously and are more dangerous than those which are committed openly” (1456;
Council of Trent, DS 1680).
Check: Pope Francis On Confession