III. Offenses Against Truth

From The Catechism of the Catholic Church

2484
The gravity of a lie is measured against the nature of the truth it deforms,
the circumstances, the intentions of the one who lies, and the harm suffered by
its victims. If a lie in itself only constitutes a venial sin, it becomes
mortal when it does grave injury to the virtues of justice and charity.

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER TWO YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF
  - Article 8 THE EIGHTH COMMANDMENT
    - III. Offenses Against Truth

From The Catechism of the Catholic Church – rosary.team