The Bible:
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Mark 9:14-29 The Healing of a Boy with a Demon
The Catechism of the Catholic Church (CCC)
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CCC 166-184 We Believe
Official Church Documents:
- Lumen Fidei, Encyclical Letter of Pope Francis, June 29 2013
Other Sources:
- Summa Theologiae II-II q. 10 Of Unbelief in General, St. Thomas Aquinas
- Doubting Thomas and Mercy, Fr. Michael Cummins, Word on Fire