Why five stones?
Have you ever tried to "fit into" some other person's image of you? You know what I mean - someone says you should dress a little more like _____, you should wear a little more eye shadow, or perhaps you should trade in those comfortable "practical" shoes for those spikes of death! They try to "remake" you because they figure you need an improvement on what it is you already have. The problem is - you usually "fit" what you "have" pretty well! Jeans and comfortable shoes are who you are - not frilly, painted, and stilted! I think David kind of had one of those moments when Saul, the King of Israel, he planned to go out against Goliath with nothing more than his "shepherd" outfit. As a matter of fact, scripture tells us King Saul "outfitted David as a soldier in armor". The very next verse says David couldn't even walk in the stuff! He could barely take a step forward, much less maneuver well in battle...