- Immaculate Conception (meaning God applied the merits of the cross to her in a miraculous way, saving her, through Jesus, at the outset of her life, rather than later on like the rest of us)
From the earliest Tradition, Mary was known as “all holy,” as “ever-virgin,” as the “New Eve,” and as the “co-operator” in the plan of salvation. True, her Immaculate Conception was not formally defined by the Catholic Church until 1854 (but then again, the NT canon and Trinity weren’t defined until the 4th century, nor was transubstantiation defined until the 13th century). Yet, the earliest Christians understood an “all-holiness” about her (and early CFs like St. Justin Martyr, St. Irenaeus and Tertullian referred to her as the “New Eve” while others, including St. Hippolytus, St. Ephraim, St. Ambrose and St. Augustine, specifically wrote about her sinlessness). Even CFs like Origen, who intimated that Mary sinned once (just once!! – I’ve never seen a CF say Mary was a common sinner like everyone else), elsewhere wrote that she was “all holy.” It took centuries of the most brilliant Christian minds (e.g., St. Augustine, St. Cyril of Alexandria and Duns Scotus), aided by the Holy Spirit I believe, to fully realize her special role in Christianity, including her Immaculate Conception, which I believe is the logical conclusion or “fleshing out” of Mary as “New Eve” (Eve was created without sin and Mary was, through God’s grace, even greater than Eve, remaining free from sin throughout her life). Indeed, Mary’s Immaculate Conception is supported by at least three passages in Scripture (Gn. 3:15 “complete” enmity between Satan and Mary could only exist if Mary was never under the bondage of sin]; Lk. 1:28 [Mary was full of grace]; and the passages prefiguring Mary as the Ark of the New Covenant).
- Indulgences
The Church has the power to forgive sins (John 20:21-23; Matt. 16:19, 18:18), i.e., the power to remit the eternal punishment due sin – hell. This is the consensus view of the CFs. In fact, the sole point of difference between the Catholic Church and the Novatians was that the Novatians denied the Church’s the authority to forgive mortal sins committed after baptism. The universal Church affirmed this authority from the beginning. If the Church possesses the authority to remit the eternal punishment due sin, it is not a stretch to believe that it possesses the lesser power of remitting the temporal punishment due sin, i.e., the authority to grant indulgences. Check out Thomas Aquinas’ “Summa Theologica” for a more detailed explanation of indulgences.
- Purgatory
Purgatory too is grounded both in Scripture (2 Macc. 12:39-46; Matt. 5:25-26; Matt. 12:32; 1 Cor. 3:10-15; Rev. 21:27) and Tradition. From the earliest Tradition, Christians prayed for the dead (as can be seen in the numerous graffiti in the Roman catacombs). CFs recording this belief include Abercius, Tertullian, St. Cyril of Jerusalem, St. Ephraim, St. Epiphanius, St. John Chrysostom, St. Ambrose and St. Augustine (who said that “the whole Church observes this practice which was handed down by the Fathers”). Clearly, it is pointless to pray for those in heaven or hell – these prayers presuppose a third place, purgatory. Likewise, many CFs wrote about a cleansing or purgatorial fire after death, including Tertullian, Origen, St. Cyprian, St. Basil, St. Gregory of Nyssa, St. Augustine, St. Caesar and St. Gregory the Great. Again, read Thomas Aquinas’s “Summa Theologica” for a more detailed discourse about purgatory.
Finally, I’ll pose this question – if St. Augustine, a contemporary of St. Vincent, were somehow to time-travel to the 21st century, where do you think he would go to church on Sunday? Bear in mind that he believed in the Real Presence, baptismal regeneration, infant baptism, apostolic succession, the Roman primacy, a ministerial priesthood to administer the sacraments, confession, salvation “not by faith alone,” purgatorial fire and praying for the dead, a hierarchical/institutional Church – and he called himself “Catholic.”
Hope this helps.