What does 1 Samuel 17:25 mean?

Israel's army is gathered for war with the Philistines, but terrified by an apparently unbeatable giant (1 Samuel 17:1–11, 23–24). The Israelite soldiers talk amongst themselves. The giant, Goliath of Gath, has challenged Israel to champion warfare. If one of their men could kill him, the Philistines would surrender. If he prevailed, the Israelites would be the Philistines' servants. In full protective gear and with spear in hand, Goliath taunts the Israelite army twice a day for forty days (1 Samuel 17:16). When he does, the soldiers flee (1 Samuel 17:23).

Here, the Israelite men talk about the imposing champion and his defiance. They also talk about the reward King Saul would give to any Israelite who could defeat the Philistine. Their king, apparently unable or unwilling to fight Goliath himself, was willing to give an extravagant reward to any man who could win the battle. The giant-killer would quickly become one of the most powerful and important men in Israel. Not only would he become instantly wealthy, but he would also marry into royalty, becoming a member of the king's own household. In addition, his own extended family would be freed from any obligation to taxes or forced service to the king.

Yet even with such an enticing promise, no man volunteered to take on the seemingly impossible task.