IV. The Gravity of Sin: Mortal and Venial Sin

From The Catechism of the Catholic Church

1854
Sins are rightly evaluated according to their gravity. the distinction between
mortal and venial sin, already evident in Scripture,¹²⁹ became part of
the tradition of the Church. It is corroborated by human experience.

PART THREE: LIFE IN CHRIST

SECTION ONE MAN’S VOCATION LIFE IN THE SPIRIT
- CHAPTER ONE THE DIGNITY OF THE HUMAN PERSON
  - Article 8 SIN
    - IV. The Gravity of Sin: Mortal and Venial Sin

From The Catechism of the Catholic Church – rosary.team