The Catechism of the Catholic Church (CCC)
Official Church Documents:
- Paenitentiam Agere, Pope Saint John XXIII, Encyclical on the Need for the Practice of Interior and Exterior Penance, Paragraphs 8-14 and 28-29.
- Dominum et Vivificantem, Pope Saint John Paull II, Encyclical on the Holy Spirit in the Life of the Church and the World, Paragraph 3.
- Angelus, Pope Benedict XVI, The Feast of the Baptism of the Lord, January 7, 2007
- St. Thomas Aquinas, Summa Theologiae, Third Part, Question 38: The Baptism of John the Baptist and what it means for us