| King David chose five stones from the brook in preparation for his battle with the evil giant, Goliath. The five stones correspond with the five words of Kriat Shema: "Shema Yisrael HaShem Elokenu HaShem" followed by "Echad" -- the declaration of the Unity of HaShem. Miraculously the five stones melted into one stone. King David merited to subdue Goliath, by striking him on the forehead with that very stone. Why was King David's victory over Goliath dependent upon his deep awareness of HaShem's unity? Everything that exists in the universe is created by HaShem and subject to His Will. As he gathered the five stones, King David concentrated on the Oneness of HaShem. He heightened his consciousness that everything, even the evil Goliath, is subject to the Will of HaShem.
King David's awareness of the Unity of HaShem, gave him the merit to nullify Goliath's power and to triumph over him.
Envision King David saying "Shema Yisrael" and concentrating on the Unity of HaShem, as he hurls his stone at Goliath. When you recite Shema Yisrael, have in mind the Unity of HaShem. Remember that our steadfast trust in HaShem and His Unity, awakens the merit to subdue our enemies and succeed in all of our endeavors. (Based on the commentary of RaMad Vali to Tehillim)
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