Saul's Jealousy

Saul was less astute than Jonathan, but more astute that young David. He appreciated David at first, but when he heard the song "Saul has slain his thousands, and David his ten thousands," he discovered the key to successful jealousy:

The leader saw evidence that God had chosen someone else over him.

Saul understood that God was blessing David more than Saul. In fact, much of Saul's success was due to God's blessing of David. Although he wasn't sure at first, Saul rightly suspected that David was the king who would replace him. He unfairly demoted David, and David continued to excel in a lower position, gaining favor among the people. Whatever Saul did, he could not defeat God's plan to make David king.

So why didn't Saul just face the truth, as Jonathan had, and help David? Because...