The 55th chapter of the Psalms was composed by David HaMelech as he was running away from his rebellious son Avshalom. At that point, David was also notified that Achitofel, who had been David's closest friend and adviser, had betrayed David and joined with Avshalom in his rebellion (cf. II Shmuel 15). Both Doeg and Achitofel earned the appellation of "men of bloodshed and deceit," about whom the verse says: They shall not live out half their days.
The Sages in the Gemara inform us that neither Doeg nor Achitofel lived to the age of 35 years, less than half the life span of an average person, which is seventy years (Sanhedrin 106b). After being betrayed once again, David teaches us that when one is hounded, there is only one solution: prayer.
Cast upon Hashem your burden and He will sustain you (v. 23). Though the basic meaning of this verse is that it refers to the burden of one's livelihood, it can also refer to all of life's troubles and burdens. Regardless of how hopeless the situation may seem, when one throws his burden upon the shoulders of the Almighty, he can be assured that his prayers will be answered. The overwhelming weight is lifted, as one is freed from worry and anxiety.
In verse 18, though David is clearly restless and greatly agitated, the very fact that King David could still muster the strength and proper mindset for prayer, despite the inner turmoil he was experiencing, was a clear sign to David that G-d had already heard his voice and supplication. David recognizes and expresses that every peaceful, happy day that he ever experienced had also been a gift of G-d's omnipotence and goodness, since it was only He Who had always delivered him from impending peril.
It was Hashem Who raised David far beyond any such danger even in those days when the masses did not stand arrayed against him as they did presently. Even in those better times, when he had hosts of supporters among his people, even the most intimate support of his closest friend, it was never to the masses and hosts of supporters, but to G-d alone that David owed his peace and happiness.
Occasionally we forget David's timely message of hope. However, Hashem is certain to remind us, and sometimes the most unlikely of messengers are the ones
who deliver the encouragement. In this Psalm David teaches us when and
how to ask for Hashem's help and support (v. 18): "Evening, morning, and
noon, I supplicate and moan; and He has heard my voice."
face challenges in our lives. Some we feel equipped to handle; others
seem ridiculously daunting and unfair. In all instances, though, we are
advised, "Throw it all onto Hashem's lap, pray and cry out to Him with
heartfelt concentration." He knows you can't do it on your own. No one
Humble yourselves, therefore, under G-d's mighty hand, that he may lift you up in due time. Cast all your anxiety on him because he cares for you. (cf. I Peter 5:6-7)
Let him who is convinced that his views are true and right express them . . . at every opportunity . . . without considering how much support or how much opposition he will encounter. Only falsehood is in need of many supporters in order to win the day; falsehood must have the authority of numbers to make up for what it lacks in justification. Truth, by contrast, will always prevail, even if it takes time. Noble, courageous and pure, expressed with all the fiery zeal and conviction and with all clarity of sure awareness, stated again and again at every opportunity, truth will ultimately gain respect and admiration even of those who do not accept it. The only truth that can be lost beyond recall is that truth whose adherents no longer have the courage to speak up candidly on its behalf. Truth has never gone down in defeat as the result of opposition, it has done so only when its friends are too weak to defend it. - R' S.R. Hirsch