There was war again: and David went out, and fought with the Philistines, and killed them with a great slaughter; and they fled before him.
      II. Saul continues his malice against David. He that but the other day had sworn by his Maker that David should not be slain now endeavors to slay him himself. So implacable, so incurable, is the enmity of the serpent against that of the woman, so deceitful and desperately wicked is the heart of man without the grace of God, Jeremiah 17:9. The fresh honours David had won in this last war with the Philistines, instead of extinguishing Saul's ill-will to him, and confirming his reconciliation, revived his envy and exasperated him yet more. And, when he indulged this wicked passion, no marvel that the evil spirit came upon him (1 Samuel 19:9; 1 Samuel 19:9), for when we let the sun go down upon our wrath we give place to the devil (Ephesians 4:26; Ephesians 4:27), we make room for him and invite him. Discomposures of mind, though helped forward by the agency of Satan, commonly owe their origin to men's own sins and follies. Saul's fear and jealousy made him a torment to himself, so that he could not sit in his house without a javelin in his hand, pretending it was for his preservation, but designing it for David's destruction; for he endeavored to nail him to the wall, running at him so violently that he struck the javelin into the wall (1 Samuel 19:10; 1 Samuel 19:10), so strong was the devil in him, so strong his own rage and passion. Perhaps he thought that, if he killed David now, he would be excusable before God and man, as being non compos mentis--not in his right mind, and that it would be imputed to his distraction. But God cannot be deceived by pretences, whatever men may be.