David will always beat Goliath because David’s Heart is united with God’s Heart

Yes David was called arrogant.
Yes, David was called inexperienced. Yes, David did not have the stamp of approval from this brethren.
Yes, David did not used the weaponry of those who were scared and who refused to fight anyway.

But David will always beat Goliath not because of resources or arrogance approval from men, but because of faith and dependence in the Word of God, and the covenant love desire to bring Glory to God, and remove reproach from God’s people. David was a man who was sensitive to the Spirit of God because he was after the heart of God.

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?

27 And the people answered him after this manner, saying, So shall it be done to the man that killeth him.

28 And Eliab his eldest brother heard when he spake unto the men; and Eliab’s anger was kindled against David, and he said, Why camest thou down hither? and with whom hast thou left those few sheep in the wilderness? I know thy pride, and the naughtiness of thine heart; for thou art come down that thou mightest see the battle.

29 And David said, What have I now done? Is there not a cause?

Don’t Stress the Small Battles

The lion and the bear were just practice for Goliath! Goliath was just practice for entire Nations! Don’t stress out for the small battles… keep your eyes on the glory of God.