The Spirits' Book
Book Two - The Spirit World
Chapter VII - Return to Physical Life
Before the Return
332. Can a spirit hasten or delay its reincarnation?
“It may hasten it by a strong, faithful desire. As there are spineless and indifferent spirits, just like regular people. It may delay it if it shies away from the trial assigned to it, but it cannot do so freely. It suffers for this hesitation, just as a sick people suffer when they fail to use the remedy that can cure them.”