Allan Kardec-THE Spirit's Book_ The Principles of Spiritist Doctrine (1989)

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THE SPIRITS’ BOOK
"He could, certainly, as a spirit, see his friend, and know what is his situation; and if the
belief in the death of that friend had not been imposed on him as an expiation, he might retain
an impression of his existence, as, in the contrary case, he might retain that of his death."
Occult Transmission of Thought
419. Whence comes it that the same idea-that of a discovery, for instance-so often suggests
itself at the same time to several persons, although they may be at a distance from one
another?
“We have already said that, during sleep, spirits communicate with one another; well, when
his body awakes, a spirit remembers what he has learned, and the man thinks he has invented
it. Thus several persons may find out the same thing at the same time. When you say that an
idea is 'in the air,' you employ a figure of speech that is much nearer the truth than suppose.
Every one helps unconsciously to propagate it."
In this way our spirit often reveals to other spirits, without our being aware of it. that which formed the
object of our meditations before we went to sleep.
420. Can spirits communicate between themselves when the body is awake?
"A spirit is not enclosed in his body as in a box, but radiates around it in every direction. He
can, therefore, hold communication with other spirits even in the waking state, although he
does so with more difficulty."
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. They may be said to speak the
language of spirits.
Lethargy, Catalepsy, Apparent Death
422. In lethargy and catalepsy, the patients generally see and hear what takes place around
them, but are unable to manifest their impressions. Is it through the eyes and ears of the body
that these impressions are received?