When David met Goliath, the armies of Israel were very fearful of the Philistine army and were probably praying to God to shield and protect them from the Philistines. David did not join in with their voices of fear. Instead, he spoke his opinion.
1 Samuel 17:26 And David spake to the men that stood by him, saying, What shall be done to the man that killeth this Philistine, and taketh away the reproach from Israel? for who is this uncircumcised Philistine, that he should defy the armies of the living God?
David's focus was on God, not the enemy. David knew that one person, and God, were a majority. And with this thought in mind, David attacked Goliath the giant and defeated him, with a sling. David knew God, and knew God was the most...