The Spirits' Book
Book Three - Moral Laws
Chapter X - IX. Law of Liberty
847. Do anomalies of the faculties deprive individuals of their free will?
“If the intelligence of human beings is altered by any cause whatsoever, then they are no longer the masters of their thoughts and are no longer free. Such anomaly is often an atonement for spirits who, in another life, have been vain or arrogant, or have made bad use of their faculties. They may be reborn in the body of a mentally impaired person, as a tyrant may be reborn in the body of a slave, and a callous wealthy man in that of a beggar. Such spirits suffer from this constraint, of which they are fully aware, and this is the action of matter.” (See Q371 et seq.)