Ok, I have written on this before, but yet another clarification.
Only the Pope from the Chair of Peter, when he is addressing Faith and Moral is infallible as well as when he signs and agrees to council documents.
The personal writings of saints are not infallible unless they pertain exactly to what a Pope has declared as infallible.
So, for example, if Padre Pio has a vision, his writings are not infallible.
However, if he writes on a doctrine of the Church already approved by a Pope or a Council and Pope, his words echo an infallible doctrine.
When the Blessed Mother appears to people, the Church decides and approves those apparitions, but not all the saints have to say on those are infallible.
Why is this so hard to understand?
When Mary told Bernadette she was the Immaculate Conception, the Church has already held that position for centuries and had declared it a dogma in Ineffabilis Deus of 8 December, 1854. Mary named herself the Immaculate Conception AFTER the Pope declared her as such.
Here is the CCC
"The Roman Pontiff, head of the college of bishops, enjoys this infallibility in virtue of his office, when, as supreme pastor and teacher of all the faithful - who confirms his brethren in the faith he proclaims by a definitive act a doctrine pertaining to faith or morals. . . . The infallibility promised to the Church is also present in the body of bishops when, together with Peter's successor, they exercise the supreme Magisterium," above all in an Ecumenical Council.418 When the Church through its supreme Magisterium proposes a doctrine "for belief as being divinely revealed,"419 and as the teaching of Christ, the definitions "must be adhered to with the obedience of faith."420 This infallibility extends as far as the deposit of divine Revelation itself.
Never has there been a declaration on Faith and Morals made from a vision or a private revelation. All revelation from God ended with the Book of Revelation. That is Church teaching. Here is the section from the CCC.
THE TRANSMISSION OF DIVINE REVELATION
THE TRANSMISSION OF DIVINE REVELATION
74 God "desires all men to be saved and to come to the knowledge of the truth":29 that is, of Christ Jesus.30 Christ must be proclaimed to all nations and individuals, so that this revelation may reach to the ends of the earth:
- God graciously arranged that the things he had once revealed for the salvation of all peoples should remain in their entirety, throughout the ages, and be transmitted to all generations.31
75 "Christ the Lord, in whom the entire Revelation of the most high God is summed up, commanded the apostles to preach the Gospel, which had been promised beforehand by the prophets, and which he fulfilled in his own person and promulgated with his own lips. In preaching the Gospel, they were to communicate the gifts of God to all men. This Gospel was to be the source of all saving truth and moral discipline."32
76 In keeping with the Lord's command, the Gospel was handed on in two ways:
- orally "by the apostles who handed on, by the spoken word of their preaching, by the example they gave, by the institutions they established, what they themselves had received - whether from the lips of Christ, from his way of life and his works, or whether they had learned it at the prompting of the Holy Spirit";33
- in writing "by those apostles and other men associated with the apostles who, under the inspiration of the same Holy Spirit, committed the message of salvation to writing".34
77 "In order that the full and living Gospel might always be preserved in the Church the apostles left bishops as their successors. They gave them their own position of teaching authority."35 Indeed, "the apostolic preaching, which is expressed in a special way in the inspired books, was to be preserved in a continuous line of succession until the end of time."36
78 This living transmission, accomplished in the Holy Spirit, is called Tradition, since it is distinct from Sacred Scripture, though closely connected to it. Through Tradition, "the Church, in her doctrine, life and worship, perpetuates and transmits to every generation all that she herself is, all that she believes."37 "The sayings of the holy Fathers are a witness to the life-giving presence of this Tradition, showing how its riches are poured out in the practice and life of the Church, in her belief and her prayer."38
79 The Father's self-communication made through his Word in the Holy Spirit, remains present and active in the Church: "God, who spoke in the past, continues to converse with the Spouse of his beloved Son. And the Holy Spirit, through whom the living voice of the Gospel rings out in the Church - and through her in the world - leads believers to the full truth, and makes the Word of Christ dwell in them in all its richness."39
80 "Sacred Tradition and Sacred Scripture, then, are bound closely together, and communicate one with the other. For both of them, flowing out from the same divine well-spring, come together in some fashion to form one thing, and move towards the same goal."40 Each of them makes present and fruitful in the Church the mystery of Christ, who promised to remain with his own "always, to the close of the age".41
81 "Sacred Scripture is the speech of God as it is put down in writing under the breath of the Holy Spirit."42
"And [Holy] Tradition transmits in its entirety the Word of God which has been entrusted to the apostles by Christ the Lord and the Holy Spirit. It transmits it to the successors of the apostles so that, enlightened by the Spirit of truth, they may faithfully preserve, expound and spread it abroad by their preaching."43
82 As a result the Church, to whom the transmission and interpretation of Revelation is entrusted, "does not derive her certainty about all revealed truths from the holy Scriptures alone. Both Scripture and Tradition must be accepted and honored with equal sentiments of devotion and reverence."44
83 The Tradition here in question comes from the apostles and hands on what they received from Jesus' teaching and example and what they learned from the Holy Spirit. The first generation of Christians did not yet have a written New Testament, and the New Testament itself demonstrates the process of living Tradition.
Tradition is to be distinguished from the various theological, disciplinary, liturgical or devotional traditions, born in the local churches over time. These are the particular forms, adapted to different places and times, in which the great Tradition is expressed. In the light of Tradition, these traditions can be retained, modified or even abandoned under the guidance of the Church's Magisterium.
Revelations from saints unless containing doctrine are not infallible. Canonizations are infallible decisions, but not Blesseds or Venerables.
Comments and questions are welcomed.