What was the meaning of the ancient Jews in the parable of David and Goliath.

From the Bible, we are well aware of the story of David and his duel with the giant Goliath. In this duel, despite his low physical strength, David was able to defeat the powerful Philistine. This is due to the fact that David entrusted his victory to God, who gave strength to the young man, thanks to his well-aimed shot from a sling, he was able to knock Goliath off his feet. The essence of this event also lies in the fact that you need to see not the magnitude of the problem, but its solution. So here David was a weak young man, but he was able to defeat a huge, three meters tall warrior.