To show the possibility of communication with the beings of the spiritual world, to demonstrate to us the proof of immortality. The mere fact that man can communicate with the beings of the spiritual world has incalculable consequences of the greatest gravity; a new world is revealed to us, to which we will all go without exception. The knowledge of this fact cannot fail to bring about, when it becomes generalised, a profound modification in customs, character, habits and beliefs. It is a total revolution in ideas, a revolution all the greater and all the more powerful because it is not confined to one people or to one caste, but reaches simultaneously to all classes, to all nationalities and to all religions.

Although mediumistic phenomena have existed in every century and age, it is only now with the development of science that we can rid them of superstition and ridiculous interpretations. And since we are no longer under the yoke of religion, which for centuries has inquisitorially condemned and persecuted mediumship, it is only a question of time before these facts become more and more evident.

By mediumship we obtain not only the material proof of the existence and individuality of the soul, but we also understand the solidarity which links the living with the dead of this world, and the dead of this world with those of other planets. We know their situation in the spirit-world; we accompany them in their migrations; we witness their joys and sorrows; we know why they are happy or unhappy, and we know what fate is in store for ourselves, according to the good or evil we have done. This communication initiates us into the future life, which we can observe in all its phases, in all its vicissitudes; the future is no longer a vague hope, but a positive fact, a mathematical certainty. From then on, death is no longer frightening for us, because it means liberation, the gateway to true life.

Through the study of the situation of spirits, we know that happiness and unhappiness in the spiritual life are inherent in the degree of perfection or imperfection; that each one suffers the direct and natural consequences of his faults, and that these negative consequences cease with repentance and reparation. That perfection depends solely on oneself, and that through free will one can prolong or shorten one's sufferings, just as the sick person suffers from his excesses until he does not put an end to them.

But spirits do not always know more than we do, or do not tell us all that they know, and often refrain from giving us what we can obtain by work; for there are matters which they are not permitted to reveal to us. If they can initiate us into that which concerns the future life, into a great number of matters of which we are ignorant, and which we cannot learn in the field in which we find ourselves. In matters which otherwise we could only hypothesise, or misinterpret, such as heaven and hell. Through mediumship it is the eyewitnesses, the very protagonists of the life beyond the grave, who come to tell us what that life consists of, and only they could do so. Their manifestations have thus served to acquaint us with the invisible world around us, of which we were not even aware; and this knowledge alone would be of the greatest importance, if the spirits could teach us nothing else.

Mediumship in its many manifestations and types can also become a tool for helping and doing good. This faculty is a temporary loan to the medium who, if he wants to make good use of it, must understand the need for study and practice in the most suitable conditions, from humility, understanding the great fallibility that every medium has. The best medium is the one who is least often deceived, for all are deceived at some time, even if only as a test and apprenticeship, hence the need for group work, with study and analysis of communications. The good medium is not the one who is concerned with giving more or less communications, but the one who serves as an intermediary of good, whether or not he makes use of mediumnity; and at every moment mediums and non-mediums can do much good without the need to enter into a trance.