Biblical Answer

David learned several important things when he fought Goliath. Firstly, he learned that God is his strength, not his own physical prowess. Despite being the youngest and smallest in the army, David trusted in God's power and fought with confidence. He rejected Saul's armor, which represented the conventional strength of human warfare, and instead chose to fight with a sling and a stone. This act of faith demonstrated that David understood that God was his true strength, not his own abilities.

Secondly, David learned the importance of faith in God's promises. He had heard God's promise to Samuel that he would raise up a king from the tribe of Judah (1 Sam. 16:1-13), and he believed that he was that king. He also trusted in God's promise to deliver him from the lion and the bear (1 Sam. 17:34-37), which gave him the confidence to face Goliath. David's faith in God's promises gave him the courage to stand up against the giant and ultimately defeat him.

Lastly, David learned that God's strength is not limited by human circumstances. Despite being vastly outnumbered and outmatched by the Philistine army, David trusted in God's power to deliver him and the Israelites. He knew that God was greater than any human enemy, and he trusted in God's promise to be with him always (Deut. 31:6). David's faith in God's strength and power gave him the victory over Goliath, and it has inspired countless people throughout history to trust in God's power in the face of seemingly insurmountable challenges.