But beyond such considerations as these, which may or may not have force, there remains the graver question still--the question of the identification of the sources from which the intelligible residue of communications is received. If we fall back upon suggestion there are always two general sources of suggestion--the incarnate and the discarnate, and among the incarnate themselves there are manifold sources of suggestion. The sitter may be unconsciously supplying the material which the medium is receiving, recasting and giving back again, or the medium may be reporting what is received from other incarnate sources than the sitter. (This, of course, when we have eliminated all that might possibly be contributed by the medium.) _The Dilemma of Spiritism_ Anything, therefore, which is known to the living may be the source of the medium's information. Only those things, therefore, which are utterly unknown to the living anywhere, which cannot possibly have been known by the medium himself or herself, can be finally and conclusively a testimony to communications from the dead. But unless the information thus received is known to the living, its truth or falsity can never be proved or disproved. This is the dilemma which spiritism is finally brought to face and from this dilemma there is absolutely no escape. It does not forbid the conclusions which may be drawn from a seeming preponderance of evidence, but it does forbid absolute certainty, for, to repeat, if the information is to be verified it must be verified by the living, which proves that some one does possess it and may have communicated it--if we assume such communication to be possible--to the medium. On the other hand, if no one at all possesses the information, then we may never be sure that it is real information, or anything else than a creation of an excited imagination.