John Orr distinguished Deists from theists by observing the positivism and negativism of Deism. Appel notes that these fears result in the schizoid's negativism, stubbornness and reluctance to love. Negativism is usually a sign of catatonia, and may progress to (catatonic) rigidity. They first distinguish between "strong negativism" and "weak negativism". It serves a symbolic burial site for negativism.