There are instances, then, of people occasionally having visions which seem to be in some way caused by departed persons. Sometimes the percipient has only one experience of the kind in his life; more often he has several, for this seeing power is somehow temperamental--a sort of gift, like the alleged second sight of the Highlander. It was well known to St Paul, as his reference to "discerning of spirits" shows (1 _Cor._, xii). With some people the experience is fairly common. And in a very few persons the gift is so strong that it is to some extent under control. I say to some extent, and I wish to use words very carefully and to have them understood very clearly at this point. I know several people, who by putting themselves into a passive and receptive condition, but without any trance state, can generally get evidential messages from somewhere; that is, messages embodying facts which the sensitive did not normally know. And some of this matter seems to be due to telepathy from the dead. But it cannot be done at will. I believe that professional mediums who sit for all comers for a fee are often, and indeed generally, quite honest people, but that they cannot distinguish between their own imaginations and what really comes through. Professor Murray, when saying what came into his head, did not know whether it was right or not; that is, he did not know, until he was told, whether he had really got the thing telepathically or whether it was an idea thrown up by his own imagination. So with professional mediums. They give out the ideas that come to them, but as a rule they cannot distinguish; and, the power not being entirely under control, there is often a large mixture of their own imagination.