One champion fights, and the outcome belongs to everyone he represents. The popular sermon puts you in David's place. The text puts you on the hill.
The Shadow
You have heard this sermon: what's your Goliath, pick up your five smooth stones, step into the valley. Almost every version puts you in the wrong place. Read the structure. Two armies, two champions, and explicit terms: one man fights for all, and the outcome belongs to everyone. For forty days no soldier in Israel moved, and that was not cowardice; it was honesty. The giant was beyond them. The problem was too big for the people it belonged to.
Then a shepherd boy walked into the valley alone, on behalf of everyone, saying the line that interprets the whole story before the stone ever flew: “the battle is the Lord's.” And when the Philistines saw that their champion was dead, they fled. The champion fell, and the army he represented fell with him. What did Israel do to earn the victory? They watched.
The Fulfillment
Sin is the giant in the valley. It stood between God and humanity issuing its challenge, and no priest, prophet, king, or sacrifice could answer it. Then one Man went. Jesus did not hand you a sling and coach you from the hillside. He walked into the valley of the shadow of death alone, and when He came out of the grave three days later, the giant was face-down in the dirt. Paul names the framework in Romans 5: as by one man's disobedience many were made sinners, so by one Man's obedience many will be made righteous. Adam entered the fight and lost for everyone he represented. Jesus entered and won the same way. One fights. All receive.
Him All Along
If you are exhausted from hurling stones at problems you were never meant to defeat alone, hear the story's actual shape: you are the army on the hill, and the champion has already gone into the valley. Your role is not to replicate the victory. It is to receive it. You don't fight for it. You live from it.