38. PREFACE - Sleep is for the purpose of resting the body; however, the Spirit needs no rest. While the physical senses are in a torpid state the soul partly frees itself from the body and enters into the enjoyment of its spiritual faculties. Sleep has been given to Man to enable him to repair both his organic and moral strengths. While the body recuperates the spent energies which have been used during the waking state, the Spirit fortifies itself amongst other Spirits. From all he sees, all he perceives and from the advice he is given, he takes the ideas which occur to him afterwards, in the form of intuitions. This is the temporary return of the exile to his true world, a momentary liberty that is conceded to the prisoner.
But it sometimes happens, as it does in the case of perverse prisoners, that the Spirit does not always take advantage of these moments of liberty for the purpose of progress. If he has bad instincts, instead of seeking the company of the good Spirits, he seeks out those who are like himself and goes to those places where he may give vent to his tendencies.
So then, the person who is convinced of this fact will lift up their thoughts to God before they go to sleep. They will ask for advice from the good Spirits and all those whose memory is dear to them, so they may go to join them for the brief moments of liberty which are conceded to them. On awakening they will then feel fortified against evil and be mare courageous when facing adversities.