In today's daily bread bible passage (1 Samuel 17:41-58) the boy David won victory over the Philistines. He defeated Goliath by striking him on the forehead with a slingshot in the name of the Lord Almighty.
Goliath and David are types of the arch enemy Satan and Jesus Christ the Savior.
For 40 days Goliath came out and taunted the Israelites. The number 40 in the Bible is usually the period of testing (of faith). David said to Saul "I am the son of Jesse." Isaiah prophesied the Savior is to come from the line of Jesse.
By the time David met the challenge the Spirit of prophecy was in operation on him for David had already been anointed so that before darting aut to Goliath he proclaimed victory in advance saying in the spirit of prophecy "victory in His name".
Five smooth river stones hidden in the shepherd's pouch represent the FAITH in the LORD as it has been said, "faith is an acronym for fantastic adventure (aggression, or attack if you will) in trusting Him."
No wonder that in Revelation 19, where the all time super champion the old serpent Satan is finally knocked down and thrown into the lake of burning sulfer, an angel explained to John that it was through the testimony of (the gospel faith in) the Lord Jesus the Savior that the victory is won.