54. There is no science which has in all its parts proceeded from the brain of one man. All, without exception, are the product of successive observations, leaning upon preceding ones, as upon a known point, in order to arrive at an unknown one. It is thus that the spirits have proceeded with Spiritism. That is why their teaching is gradual. They approach questions only in proportion and in measure, as the principles upon which they ought to lean are sufficiently elaborated, and as opinion is prepared to assimilate them. It is remarkable that, each time particular centers have wished to approach premature questions, they have obtained only contradictory responses, and never conclusive ones. When, however, the favorable moment arrives, the instruction is given universally at nearly the same moment of time.
There is, at the same time, between the march of Spiritism and that of the sciences, a capital difference. It is that the latter have attained their present advancement only after long intervals of time, whilst only a few years have sufficed for Spiritism, not to gain the culminating point, but at least to gather a sum of facts to constitute a doctrine. That is obtained by innumerable manifestations of spirits, who, by the will of God, manifest simultaneously; each one bringing the contingent of their knowledge. The result is, that all parts of the doctrine, instead of being successively elaborated during many centuries, have been concocted almost simultaneously in a few years, and that this has sufficed to group them in order to form a whole.
God has willed it thus, firstly, in order that the edifice should progress more rapidly; secondly, in order that it should have a permanent and immediate control in the universality of the teaching, each part having value as well as authority only by its connection with the whole; all becoming harmonious, finding their place in the general edifice, and each one arriving in due time.
In confiding, not to one spirit alone, the care of the promulgation of the doctrine, God has willed that the lowest, as well as the highest among the spirits, as well as among men, should carry each his stone to the edifice, in order to establish between them a structure of cooperative solidarity, which has failed to all doctrines springing from one source alone.
On the other hand, every spirit, the same as every man, having only a limited sum of knowledge, they were incapable of treating ex-professo the innumerous questions which Spiritism touches. That is why the doctrine, in order to fulfill the desires of the Creator, could not be the work of one spirit alone, nor of one medium. It could proceed only from the united work of the many, - the one controlled by the other.*
* See in “The Gospel According to Spiritism,” Introduction, item 6, and “Revue Spirite,” April, 1864, p. 90: Authority of the Spiritual Doctrine; Universal Control of the Teaching of the Spirits.