As spirits transport themselves from point to point with the rapidity of thought, they may be said to see everywhere at the same time. A spirit's tho… - Allan Kardec

Spirits incarnate themselves as men or as women, because they are of no sex and, as it is necessary for them to develop themselves in every direction, both sexes, as well as every variety of social position. furnish them with special trials and duties, and with the opportunity of acquiring experience. A spirit who had always incarnated itself as a man would be only known by men, and vice versa.

During life, a spirit is held to the body by his semi-material envelope, or perispirit. Death is the destruction of the body only, but not of this second envelope, which separates itself from the body when the play of organic life ceases in the latter. Observation shows us that the separation of the perispirit from the body is not suddenly completed at the moment of death, but is only effected gradually, and more or less slowly in different individuals. In some cases it is effected so quickly that the perispirit is entirely separated from the body within a few hours of the death of the latter but in other cases, and especially in the case of those whose life has been grossly material and sensual, this deliverance is much less rapid, and sometimes takes days, weeks, and even months, for its accomplishment. This delay does not imply the slightest persistence of vitality in the body, nor any possibility of its return to life, but is simply the result of a certain affinity between the body and the spirit which affinity is always more or less tenacious in proportion to the preponderance of materiality in the affections of the spirit during his earthly life.

A master who had been cruel to his slaves might become a slave in his turn, and undergo the torments he had inflicted on others. He who has wielded authority may, in a new existence, be obliged to obey those who formerly bent to his will. Such an existence may be imposed upon him as an expiation if he have abused his power. But a good spirit may also choose an influential existence among the people of some lower race, in order to hasten their advancement; in that case, such a reincarnation is a mission.