David, as king of Israel, was no stranger to adversity and uncertainty. He witnessed much injustice and often cried out for God to intervene. "Hear a just cause, O LORD; attend to my cry! (Ps.17:1) Even as king there were things that were beyond his control. It is encouraging to see the confidence David had that God cared and would respond, "I will call upon you, for you will answer me, O God" (v.6)
A significant element of David's confidence that God would hear him was the integrity of his own heart (v.3-5). He was not in pursuit of his own ambition, but God's purpose. He trusted God to follow through on His promises. David's emotions were anchored in his relation to Jehovah of Israel, "Keep me as the apple of your eye; hide me in the shadow of your wings" (v.8).
A second major factor that compelled David's confidence was his perspective informed by God's self-disclosure - he had a worldview from beyond the sun. Those who perpetrated injustice were "men of the world whose portion is in this life" (v.14) In other words, those whose view is limited to things "under the sun" are the self-preeminent bent on self preservation and self-promotion. What else is there?
David's view is refreshing, l"As for me, I shall behold your face in righteousness; when I awake, I shall be satisfied with your likeness" (v.15). Just because I am not in control doesn't mean things are out of control. God is good. His purpose will stand. He will bring me to my highest good and my deepest satisfaction - Himself!
As with David 3,000 years ago - so it is with us today. Knowing our end liberates and empowers us to make a significant impact for God's glory while we are yet under the sun.
Let's live with that day in view.