1 Samuel 17:50-51 –
50 So David triumphed over the Philistine with a sling and a stone; without a sword in his hand he struck down the Philistine and killed him. 51 David ran and stood over him. He took hold of the Philistine’s sword and drew it from the sheath. After he killed him, he cut off his head with the sword. When the Philistines saw that their hero was dead, they turned and ran.
You will get the Victory through PRAYER (the Stone) over the problem (Philistine).
However, the PREACHED WORD (Sword) brings the decisive blow that shows the devil that the problem (Philistine) is truly Non-resurrectible!