1 Samuel 18-19 Saul's Descent into Mental Illness. Becoming jealous of a David is one thing, developing full blown psychiatric paranoia about him is another. Saul's mind is struck by God. His mental illness develops as a result of a psychic attack. Literally, he is being driven crazy. Saul expresses behaviors which might also have been schizophrenic, and the text clearly says, twice, that this comes about because of an evil spirit from God that rests on him. Crown Prince Jonathan, son of Saul is impressed with David and the two become bonded based on their warrior code of chivalry and honor. David marries Michal, daughter of Saul, who, in a plot to kill David, choses her husband over her father. Jonathan and Michal both recognize their father's deteriorating mental health, with Michal fearing for her own safety as well as that of her husband David. This lesson teaches us a deep lesson about mental illness and that which we today call psychic attacks. This lesson serves us as a case study, with many modern-day applications and relevence.