However, some people consider Centering Prayer controversial. Some authors argue that Centering Prayer contradicts the teachings of the Carmelite saints. Others also argue that Centering Prayer is a distortion of the teachings of the Desert Fathers and "The Cloud of Unknowing", and is in contradiction to "Lectio Divina". Some consider it to fall afoul of the Congregation for the Doctrine of the Faith's caution against similar prayer forms in their "Letter to the Bishops of the Catholic Church on Some Aspects of Christian Meditation."