In the case of David, God's purpose manifestly was to exercise and strengthen such qualities as trust in God, prayerfulness, self-command, serenity of temper, consideration for others, and the hope of a happy issue out of all his troubles. His trials were indeed both numerous and various. The cup of honour dashed from his lips when he had just begun to taste it; promises the most solemn deliberately violated, and rewards of perilous service coolly withheld from him; faithful services turned into occasions of cruel persecution; enforced separation from beloved friends; laceration of feelings from Saul's cruel and bloody treatment of some who had befriended him; calumnious charges persisted in after convincing and generous refutation; ungrateful treatment from those he had benefited, like Nabal; treachery from those he had delivered, like the men of Keilah; perfidy on the part of some he had trusted, like Cush; assassination threatened by some of his own followers, as at Ziklag,--these and many other trials were the hard and bitter discipline which David had to undergo in the wilderness.
And not only was David thus prepared for the great work of his future life, but as a type of the Messiah he foreshadowed the deep humiliation through which He was to pass on His way to His throne. He gave the Old Testament Church a glimpse of the manner in which "it became Him, by whom are all things and for whom are all things, in bringing many sons unto glory, to make the Captain of their salvation perfect through suffering."
The growth of the malignant passion of jealousy in Saul is portrayed in the history in a way painfully graphic. First, it is simply a feeling that steals occasionally into his bosom. It needs some outward occasion to excite it. Its first great effort to establish itself was when Saul heard the Hebrew women ascribing to David ten times as great a slaughter as they ascribed to Saul. We cannot but be struck with the ruggedness of the women's compliment. To honour David as more ready to incur risk and sacrifice for his country, even in encounters involving terrible bloodshed, would have been worthy of women, and worthy of good women; but to make the standard of compliment the number of lives destroyed, the amount of blood shed, indicated surely a coarseness of feeling, characteristic of a somewhat barbarous age. But the compliment was quite significant to Saul, who saw in it a proof of the preference entertained for David, and began to look on him as his rival in the kingdom. The next step in the history of Saul's jealousy is its forming itself into an evil habit, that needed no outward occasion to excite it, but kept itself alive and active by the vitality it had acquired. "And Saul eyed David from that day and forward" (ver. 9). If Saul had been a good man, he would have been horrified at the appearance of this evil passion in his heart; he would have said, "Get thee behind me, Satan;" he would have striven to the utmost to strangle it in the womb. Oh! what untold mountains of guilt would this not have saved him in after life! And what mountains of guilt, darkening their whole life, would the policy of resistance and stamping out, when an evil lust or passion betrays its presence in their heart, save to every young man and young woman who find for the first time evidence of its vitality! But instead of stamping it out, Saul nourished it; instead of extinguishing the spark, he heaped fuel on the flame. And his lust, having been allowed to conceive, was not long of bringing forth. Under a fit of his malady, even as David was playing to him with his harp, he launched a javelin at him, no doubt in some degree an act of insanity, but yet betraying a very horrible spirit. Then, perhaps afraid of himself, he removes David from his presence, and sends him out to battle as a captain of a thousand. But David only gives fresh proofs of his wisdom and his trustworthiness, and establishes his hold more and more on the affections of the people. The very fact of his wisdom, the evidence which his steady, wise, and faithful conduct affords of God's presence with him, creates a new restlessness in Saul, who, with a kind of devilish feeling, hates him the more because "the Lord is with him, and is departed from Saul."