David used only one stone to defeat Goliath and the entire Philistine army (1 Sam. 17:49, 50). One stone set right the many blasphemies Goliath shouted at God’s people day after day (1 Sam. 17:16, 23). One stone redeemed the disobedience of every Israelite soldier who did nothing to resist Goliath. One stone was all God needed to save His people.
Likewise, Paul says that the act of one man—Jesus—brought grace to many. One act of self-giving atoned for generations of selfishness and sin—past, present, and future. One righteous life laid down swallowed up centuries of death and brought resurrection life to myriads of people. One act of obedience compensated for countless acts of disobedience committed by billions of people every day in every age (Rom. 5:15-21).
Considering the awesome, far-reaching, unending power of Jesus’s death and resurrection, can we not trust Him with our own failings, whether committed years or minutes ago? Can we not face that which is fallen, that which is satanic, and echo David’s words to Goliath: “I come against you in the name of the Lord Almighty, who died and rose again, whom you have defied. THIS DAY, the Lord will hand you over to me, and I’ll strike you down by the power of His cross” (1 Sam. 17:45, 46).
The Voice of One 
Just as David gathered five smooth stones from the stream in the valley, there were five wounds on the cross out from which came blood and water. After the victory, David took Goliath of Gath’s skull to Jerusalem to show it off. He left it there at “Gol-gatha” where the cross would be about 1,000 years later.
Cool connections. Thanks for expanding the conversation!