A reader writes:
You have remarked before that the Pope’s infallibility is invoked when he declares someone a saint. Is there any similar invocation of infallibility when someone is declared a Doctors of the Church?
No, there’s not. This may be illustrated by comparing the formula used in canonization with, for example, the declaration of St. Therese of Lisieux as a doctor of the Church.
As Vatican I and II point out, a pope triggers the Church’s charism of infallibility when he makes a definition, and so popes conventionally do this by using the verb "We (or I) define . . . "
In the case of a typical saint canonization, the formula used is as follows (this particular one being the canonization of Josemaria Escriva):
In honor of the Blessed and Undivided Trinity, for the uplifting of Catholic faith and the increase of Christian life, by the authority of our Lord Jesus Christ and that of the Holy Apostles Peter and Paul and our own, after careful deliberation, having called frequently upon God’s help, and with the advice of many of our brother Bishops, We declare and define Blessed Josemaría Escrivá de Balaguer to be a Saint, and We inscribe his name in the catalogue of the Saints, ordaining that, throughout the universal Church, he be devoutly honored among the Saints. In the name of the Father and of the Son and of the Holy Spirit [SOURCE].
You’ll note the bolded verbs: "We declare and define." The money verb is "We define." That’s what triggers the Church’s infallibility. It’s the traditional verb used by popes in engaging the charism of infallibility.
You’ll note that this verb is absent from proclamations that someone is a doctor. For example, when St. Therese of Lisieux was declared a doctor of the Church, this was the form of words used by John Paul II:
Fulfilling the wishes of many Brothers in the Episcopate and of a great number of the faithful throughout the world, after consulting the Congregation for the Causes of Saints and hearing the opinion of the Congregation for the Doctrine of the Faith regarding her eminent doctrine, with certain knowledge and after lengthy reflection, with the fullness of Our apostolic authority We declare Saint Thérèse of the Child Jesus and the Holy Face, virgin, to be a Doctor of the Universal Church. In the name of the Father, and of the Son and of the Holy Spirit [SOURCE].
There’s no "We define" in that. Therefore, the pope is not making a definition and so is not triggering infallibility.
The same goes for the proclamation of other titles among saints. For example, here is the form of words used to proclaim St. Thomas More the patron of statemen and politicians:
Therefore, after due consideration and willingly acceding to the petitions addressed to me, I establish and declare Saint Thomas More the heavenly Patron of Statesmen and Politicians, and I decree that he be ascribed all the liturgical honours and privileges which, according to law, belong to the Patrons of categories of people [SOURCE].
Again, no "I define."
Now, I’ve answered the question so far on textualist grounds–pointing out that the texts do not use the language popes conventionally use in triggering infallibility. I haven’t pointed out why.
The basic reason is that the status of being a doctor is different than being a saint. If someone is a saint, that means that the person is in heaven. That’s a binary, on/off thing that can be the subject of a definition more easily than what is at issue when the title of "doctor" is bestowed. Someone either is in heaven or he isn’t. But in the case of a doctor the Church is honoring someone for being a really good teacher. The quality of someone’s teaching isn’t an on/off, binary kind of thing, though. The quality of teaching is something that exists on a continuum, and one that cannot be measured except impressionistically. As a result, it would be less clear what is being defined if a pope attempted to define that someone "is a really good teacher" (whatever words this might be put in) rather than that someone "is in heaven."
Now, in the case of both saints and doctors there are ancillary concepts associated with the Church’s bestowal of these titles. In both cases there is the idea that the person was holy and a good example for the faithful to emulate, but these are slippery concepts that also exist on continua.
The core of sainthood is still a binary, on/off condition: being heaven.
Something similar applies in the case of patrons. Here there is also the idea that the person was holy and worthy of emulating but the core of patronage is different: The patron is a person from whom the faithful (or certain groups of the faithful) ask intercession, either in general or concerning a particular matter. The proclamation of a patron thus is more a directive to the faithful–a directive to look to this guy for intercession and to emulate his example.
Thus when John Paul II proclaimed Thomas More the patron of statesmen and politicians he used the verb "I establish" rather than just "I declare." In establishing him as a patron of certain individuals, the pope thereby directed those individuals to seek his intercession and emulate his example.
Thus there is no attempt to engage the Church’s infallibility here either since no matter is being defined; rather an exhortation or directive is being given.