David and the Philistines in the Valley of Elah

Saul and thousands of trained soldiers heard Goliath's challenge for the last 40 days, and they trembled. David hears it once and is enraged with this holy anger. He's ready to pick a fight. As John Wesley comments, a little shepherd, come but this morning from keeping sheep, has more courage than all the mighty men of Israel. Thus does God often do great things for his people by the weak things of the world.