II. Why a Sacrament of Reconciliation after Baptism?

From The Catechism of the Catholic Church

1426
Conversion to Christ, the new birth of Baptism, the gift of the Holy Spirit and
the Body and Blood of Christ received as food have made us “holy and
without blemish,” just as the Church herself, the Bride of Christ, is
“holy and without blemish.”¹³ Nevertheless the new life
received in Christian initiation has not abolished the frailty and weakness of
human nature, nor the inclination to sin that tradition calls concupiscence,
which remains in the baptized such that with the help of the grace of Christ
they may prove themselves in the struggle of Christian life.¹⁴ This is
the struggle of conversion directed toward holiness and eternal life to which
the Lord never ceases to call us.¹⁵

PART TWO: THE CELEBRATION OF THE CHRISTIAN MYSTERY

SECTION TWO THE SEVEN SACRAMENTS OF THE CHURCH
- CHAPTER TWO THE SACRAMENTS OF HEALING
  - Article 4 THE SACRAMENT OF PENANCE AND RECONCILIATION
    - II. Why a Sacrament of Reconciliation after Baptism?

From The Catechism of the Catholic Church – rosary.team