A Giant greater than Goliath

The defeat of Goliath on the battlefield of Elah was not only the means of elevating David unto the public stage of Israel, it was used to plunge David into a deep and dark season of affliction.
The trial came not in the form of a Philistine king or army, but in the person of king Saul himself.
David's success on the battlefield acted as an invisible hand, which rolled back the veil revealing the true condition of Saul's heart. And in doing so it confronted David with a greater and stronger foe than he had faced in Goliath of Gath.