Regarding this issue about the prior personal development, by the medium, as a condition for a higher quality “mediumistic filtration”, it is worth mentioning again another Yvonne Pereira’s notable work, "Delving into the Invisible” (Devassando o Invisivel). In its third chapter, entitled "Frederick Chopin, in Spirituality", the great composer Chopin would have asked Yvonne to study a little musical theory, as he only knew how to express himself through music. Thus, if Yvonne had a minimum of musical knowledge, Chopin could bring musical compositions. However, Yvonne did not have the aforementioned knowledge, nor the time, money and/or availability to create such prerequisites. Furthermore, she knew that her doctrinal contribution through the texts themselves was more important. Soon, this Chopin-Spirit project ended up being left aside.
We can assume that it was through the most elementary scores or in a simpler way that Chopin could, with great difficulty, bring the music to Yvonne, but her psychic influence would limit Chopin's musical quality, to the point that he could not use his famous name, as critics would not identify the extraordinary composer. In this way, what could become important evidence of the immortality of the soul and of mediumship would end up being used to demoralize the mediumistic phenomenon, and, consequently, the very immortality of the soul on the part of skeptics and materialists, unless it only used a pseudonym. However, considering this last option, the relevance of the work would be substantially diminished, in terms of proving the survival of the soul after the death of the physical body.
Let us see what the noble medium explains regarding questions 3 and 4:
Yvonne: “3- The most prudent way to manage this part is the following, practice established in the most enlightened and judicious Spiritist Centers:
a) Theoretical sessions for the development of the candidates. Crucial study of “The Book of Mediums” by Allan Kardec, and other works that help the effort to tune one's own vibrations with the forces from above.
b) If candidates have good morals, good health and a desire to serve God and others, if they already attend study sessions, taking advantage of the instructions received, the criterion of the Doctrine and the responsibility assumed, they will be able to apply passes, in the same center or outside it, accompanied by more experienced brothers, when starting the mister. This is the work of faith and courage, without bureaucracy, and we have nothing to fear, as we will be secretly assisted by Christ's messengers.
It would be a mistake, however, to assume that, in order to apply passes, we need to receive spirits and be developed mediums. This method is false, unfortunate infiltrations of other currents of ideas in the lucid Doctrine of the Spirits, codified by Allan Kardec.
Applying passes judiciously, in the sublime work of Charity, with fervor, responsibility and love, the suitor will certainly be assisted by the messengers of good and, if he has other faculties, he will develop them smoothly, naturally, safely, in spiritual bands protective and enlightened, without the need to go through those terrible obsessive periods provoked by the development sessions, forcing the explosion of the faculty that may not exist. These are the normal cases.
c) In addition to the work on passes, the candidate will be able to attend practical meetings called “of charity” (not for disobsession), outside the table, in a “second current”. May the president not bother with him. The day he, the medium, feels any abnormality, he sits down at the table and, for sure, the case will be resolved.
He should also study the Spiritist Doctrine and the Gospel daily, avoiding, however, fanaticism for mediumistic works and carefully meditating on the classics, observing modern research; pray, beg, offer your work to Jesus, learning from him to be good and humble of heart and to renounce, although the preparation for the necessary renunciations for the good progress of the works is slow, progressive; and to do charity, also without fanaticism, rather balanced and useful. It is a moral renewal that is necessary to achieve good mediumship.
The medium, moreover, should not and cannot think about his own duties just when he sits at the table, but every hour he lives, since he is an antenna that is always awake, that will receive everything, and that could harm himself and his mediumistic work for many different ways, if he neglects his own responsibilities.
For cases of obsession or strong performances in undeveloped mediums, it will not be convenient to develop them on that occasion. In this abnormal state, the medium becomes a sick person who needs treatment first of all. The most prudent thing will be to transfer the entity to another medium, talk to him in order to clarify him, and treat the medium cautiously, including clarifying him as well.
To indoctrinate the entity using the tormented medium is to harm him even more, as he may not have the necessary criteria for such an undertaking, nor bear the responsibility of the commitment; to develop his faculty on this occasion is to open up the possibility for new obsessions. Charitable work, whatever it may be, will be a saving resource (Yvonne A. Pereira).
The clarity and objectivity of Yvonne Pereira's text is impressive. Interestingly, her recommendation so that “candidates for mediumship” can consider the possibility of working with the passes, as a mediumship preparation, since, in fact, such practice can help in the so-called “fluidic perception”, be it (the fluid), coming from Superior or Inferior Spirits.
Also interesting is Yvonne's recommendation that the practice of the passes, especially for these beginners, be done in a group, especially when outside the Spiritist Center.
Yvonne also emphasizes that the Spiritist pass completely dispenses with the so-called “mediumistic incorporation”. In addition, it is highlighted that such preparation of candidates for mediumship, before attending mediumistic development itself, is spiritually safer for the medium, as it occurs “... without the need to go through those terrible obsessive periods provoked by development sessions , forcing the explosion of faculty that may not exist”.
Subsequently, Yvonne recommends that when candidates for mediumship and/or mediumistic meetings, not necessarily ostensive, are able to attend mediumistic meetings, they do not necessarily remain around the table. Moreover she reinforces that the medium “...Must also study the Spiritist Doctrine and the Gospel, daily, avoiding, however, fanaticism for mediumistic works and carefully meditating on the classics, observing modern research...”.
The question would be, Are we studying the Doctrine and the Gospel daily?
We are studying, in addition to mediumistic works (and it is worth remembering that Yvonne was an action medium and produced mediumistic works of great value, such as “Memoirs of a Suicide”), the so-called “classic works”, as well as the books by Leon Denis, Gabriel Delanne, Ernesto Bozzano, among others?
Another issue: are we “looking at modern research”?
These are reflections that should be made by all leaders, indoctrinators, mediums and militant Spiritists.
It should not be forgotten that mediumship is a gift from God, which we must not abuse.
We must, yes, treat it with love and respect, cultivate it with method, humility and skill.
It is useful to remember that a medium will not only be recommended to produce beautiful pages of literature, but also, and above all, to console suffering hearts, wipe away tears of affliction, help the unfortunate, providing them with Love and Hope, because for that he has the credentials of intermediary between Earth and Heaven (Yvonne A. Pereira)”. 
Yvonne Pereira comments on the “various types” of psychographic mediums, implying that each one has its own characteristics, which cannot be neglected by directors and confreres, when we create expectations about what they can produce as a medium. Yvonne goes so far as to say that this “excessive pressure” from peers is a generating factor of the psychic phenomenon.Yvonne also emphasizes that “being a medium” is not enough to be a good psychographer: “If the medium does not have literary gifts, it will be in vain to try, as he will only obtain mediocre productions”. If we accept this interesting and reasonable comment, we have to admit that Chico Xavier, Yvonne Pereira and Divaldo Franco may not have had the opportunity to enjoy many years of schooling in this last incarnation, but they were not “properly ignorant individuals” (not even in their youth), as we have already seen some individuals claim.It is evident that Yvonne is concerned with the goals and productivity of mediumistic work. We do not always identify the quality of the products of this work at first, but after a certain time, we will be able to perceive the level of contribution and/or limitations of the mediumistic effort. In any case, trying to take various preparatory measures, foreseeing problems and acting without haste, we will tend to build a mediumistic work with a more solid quality and a more significant contribution to the spiritist effort.
Yvonne also reinforces that “poet psychography mediumship” is a very peculiar specialty and difficult to obtain. She tells the medium: “Poetry is in the same condition: not all literary mediums will produce poetry, as this gift is another specialty in psychography”.
Yvonne comments that her discussion on the respective subject was the “result of long observations around the case, the advice of the Good Spirits and the recommendations of the great masters of the Spiritist Doctrine”.
In conclusion, our admirable confrere states: “It is important not to forget that mediumship is a gift from God, which we must not abuse”. And she adds: “We must, yes, treat him with love and respect, cultivate him with method, humility and skill, based on the Gospel, making him an instrument of Charity and Faith”.
It is evident that Yvonne is concerned with the goals and productivity of mediumistic work. We do not always identify the quality of the products of this work at first, but after a certain time, we will be able to perceive the level of contribution and/or limitations of the mediumistic effort. In any case, trying to take various preparatory measures, foreseeing problems and acting without haste, we will tend to build a mediumistic work with a more solid quality and a more significant contribution to the spiritist effort.
Concluding our study based on the last chapter of “Canticles of the Heart – volume II” (Chapter IX – “Considerations on Mediumship”) by Yvonne do Amaral Pereira, we transcribe the commentary of the admirable Spiritist writer Herminio C. Miranda. Herminio says about this publication:
“Writings by Yvonne Pereira will always be welcome. For this reason, we salute this collection that, inspired by the companions of “Leon Denis” fetched from the forgotten pages of “Workers of the Good”. This visit from the dear and devoted worker is a joy, with whom we will be able to live a little longer, through her texts full of teachings gathered in decades of study and practice of the blessed Doctrine of the Spirits. She has what to say and she says it with authority, competence and sobriety.”

Bibliographic references:
Pereira, Y. A. Songs of the Heart (Cânticos do Coração – Volume II (Spiritist Realities). First edition. CELD editions. Rio de Janeiro-RJ, 1994.
Kardec, A. The Book of Mediums [translation by Evandro N. Bezerra]. Second edition. Brazilian Spiritist Federation (FEB). Brasilia DF. 2021.
Kardec, A. The Book of Spirits [translation by Evandro N. Bezerra]. Fourth edition. Brazilian Spiritist Federation (FEB). Brasilia DF. 2021.
Pereira, Y. A. Delving into the Invisible. First special edition. Brazilian Spiritist Federation (FEB). Brasilia DF. 2004.