"Through the effects of sleep, incarnated spirits are always in connection with the spirit-world; and it is in consideration of this fact that spirits of a higher order consent, without much repugnance, to incarnate themselves among you. God has willed that, during their contact with vice, they may go forth and fortify themselves afresh at the source of rectitude, in order that they, who have come into your world to instruct others, may not fall into evil themselves. Sleep is the gate opened for them by God, that they may pass through it to their friends in the spirit-world; it is their recreation after labor, while awaiting the great deliverance, the final liberation, that will restore them to their true place.
"Dreams are the remembrance of what your spirit has seen during sleep; but you must remark that you do not always dream, because you do not always remember what you have seen, or all that you have seen. Your dreams do not always reflect the action of your soul in its full development; for they are often only the reflex of the confusion that accompanies your departure or your return, mingled with the vague remembrance of what you have done, or of what has occupied your thoughts, in your waking state. In what other way can you explain the absurd dreams which are dreamed by the wisest as by the silliest of mankind? Bad spirits, also, make use of dreams to torment weak and timid souls.
403. Why do we not always remember our dreams?
"What you call sleep is only the repose of the body, for the spirit is always in motion. During sleep he recovers a portion of his liberty, and enters into communication with those who are dear to him, either in this world, or in other worlds; but as the matter of the body is heavy and gross, it is difficult for him to retain, on waking, the impressions he has received during sleep, because those impressions were not received by him through the bodily organs."
404. What is to be thought of the signification attributed to dreams?
"Dreams are not really indications in the sense attributed to them by fortune-tellers; for it is absurd to believe that a certain kind of dream announces the happening of a certain kind of event. But they are indications in this sense, namely, that they present images which are real for the spirit, though they may have nothing to do with what takes place in his present corporeal life. Dreams are also, in many cases, as we have said, a remembrance; they may also be sometimes a presentiment of the future, if permitted by God, or the sight of something which is taking place at the time in some other place to which the soul has transported itself. Have you not many instances proving that persons may appear to their relatives and friends in dreams, and give them notice of what is happening to them? What are apparitions, if not the soul or spirit of persons who come to communicate with you? When you acquire the certainty that what you saw has really taken place, is it not a proof that it was no freak of your imagination, especially if what you saw were something which you had not thought of when you were awake?"
414 Can two persons, who are acquainted with each other, visit one another in sleep?
"Yes; and many others, who, in their waking state, do not know that they are acquainted, meet and converse together. You may, without suspecting it, have friends in another country. The fact of going, during sleep, to visit friends, relatives, acquaintances, persons who can be of use to you, is extremely frequent; and you yourselves accomplish these visits almost every night."
416. Can a man ensure the making of spirit-visits by the exertion of his will? Can he do so, for example, by saying to himself, on going to sleep, "I will tonight meet such and such a person in spirit, and speak with him about such and such a thing"?
"This is what takes place. The man falls asleep, and his spirit wakens to the other life; but his spirit is often very far from following out the plan which had been resolved upon by the man, for the life of the man excites but little interest in a spirit when he is emancipated from matter. This statement, however, only applies to men who have already reached a certain degree of elevation. The others pass their spirit-existence very differently. They give free rein to their passions, or remain inactive. It may happen, therefore, according to the aim of the proposed action, that a spirit may go to see the parties he had, as a man, proposed to visit; but it does not follow that, because he has willed to do so in his waking state, he will necessarily do so in his state of freedom."
417. Can a number of incarnate spirits, during sleep, meet together, and form assemblies?
"Undoubtedly they can. The ties of friendship, old or new, often bring together spirits who are happy to be in each other's company."
By the term old must be understood the ties of friendship contracted in anterior existences. We bring back with us, on waking, an intuition of the ideas which we have derived from these occult meetings, but of the source of which we are ignorant. Mind melding of the Tribe as per Windmill Knights comment?]
421. How comes it that two persons, perfectly awake, often have the same thought at the same moment?
"It is because two spirits, who are in sympathy, may communicate their thought to each other even when the body is not asleep."
There is, between spirits, a communication of thoughts which sometimes enables two persons to see and understand one another without having any need of human speech. [again, as per WK's comment] They may be said to speak the language of spirits.