I shall never forget being called to comfort a dear dying girl, who was much worried by Satan's suggestions. I stood by her bedside and quietly repeated these words of God to her, from Isaiah 59.19: "When the enemy shall come in like a flood, the Spirit of the Lord shall lift up a standard against him."
In a moment the cloud of sorrow and fear passed from her face; and God never let Satan worry her again!
So you will find God's words will be just like David's smooth stones, when he went up to meet the Giant!
DAVID GOES TO MEET GOLIATH.
And Goliath said, "Am I a dog that thou comest to me with staves? Come to me, and I will give thy flesh to the fowls of the air, and to the beasts of the field!"
Then David answered, "Thou comest to me with a sword and with a shield, but I come to thee in the Name of the Lord of hosts, the God of the armies of Israel whom thou hast defied. This day will the Lord deliver thee into my hand . . . and I will smite thee, and take thy head from thee. For the battle is the Lord's."
So, as the Giant came forward towards David, David ran to meet him, and put his hand into his bag and took a stone, and slang it, and it hit the Giant on his forehead, so that he sank down on the ground on his face. Then David ran, and took Goliath's own sword, and cut off his head with it.
And when the Philistines saw that their Champion was dead, they fled, and the Israelites followed after them and the Victory was won.