What is here said on the subject of communication, however, has reference to general principles only. There is no intention of suggesting that it is always undesirable to communicate with those who have passed over. Often those on the other side seek means of communicating and they should then find the most willing co-operation from this side. Sometimes one who has left the physical plane life has a message of great importance to deliver and such a case reverses the general rule--he would be delayed if he could _not_ communicate. It would be decidedly to his advantage to free his mind of the matter. Until he has done so he may remain in a restless condition and his case falls into the category of what the spiritualists call "earth bound." He may have left undone something that a message will set right, if he can get it through, or he may have secreted something that cannot be found because he died suddenly and had no opportunity to speak of it. Or it may simply be a case of desiring to prove to materialistic friends the fact that the so-called dead are not dead, and are close at hand. It is sometimes possible for the important information to come through into physical life in the form of a dream by the living, and thus the recovery of valuables has followed.[G] In such a case the dream is a memory of facts well known in astral life but hidden from the waking consciousness by the unresponsive material brain. It sometimes happens that one who thus most earnestly desires to communicate but is wholly ignorant of how to accomplish his purpose causes a good deal of annoyance. His blundering attempts to use psychic force may be wholly abortive and result only in meaningless noises, raps, the tumbling of books or dishes from shelves or the aimless movement of furniture. Annoyance is sometimes caused also by intention, on the part of those who think it is humorous to play pranks. It must be remembered that passing on to the astral life does not improve one's common sense. If while living here, he thought it amusing to astonish or delude somebody, or trick a friend into seriously accepting some absurd assertion as a fact, he still regards the same course as entertaining. This accounts for many of the foolish, and sometimes startling messages, or answers to questions, received at seances.