Spirits incarnate as men or women since they do not have sex. As
spirits must progress in everything, each sex, as each social position, imposes special trials and duties to the spirits, when acquir-
ing experiences. The one who always had to be a man would only
know what men do.
According to the Spiritism, the solidarity is not only restricted
to the Earthly society: it encompasses all worlds. The solidarity
is universal through the relationships that the spirits establish
among the several spheres, as human beings help one another
from one world to the next.