The Spirits' Book
Book Two - The Spirit World
Chapter VII - Return to Physical Life
Before the Return
337. Does God ever enforce the union of a soul with a given body?
“Sometimes it is imposed, in support of the different trials to be suffered by a spirit, especially when the latter is still too inferior to be able to make the choice for itself. As a form of atonement, a spirit may be forced to enter the body of a child that, due to its birth and the circumstances it will encounter in the world, it will serve for the spirit as a way of atonement.”