And he took his staff in his hand, and chose him five smooth stones out of the brook, and put them in a shepherd's bag which he had, even in a scrip; and his sling was in his hand: and he drew near to the Philistine. I Samuel 17:40
“As David chooses five smooth stones to be used in the task before him we see CHRIST stooping:
“HE chose five smooth stones. CHRIST is the ONE who selects those HE will send with the gospel message just as surely as HE chose those whom HE would have to hear it. “And how shall they preach, except they be sent?” (Rom 10:15)
“HE chose five smooth stones. CHRIST does all things according HIS purpose and nothing occurs by chance. David no doubt knew that Goliath had three sons and a brother who must be ultimately slain so he was merely making ready for that eventuality. (See II Sam.21:15-22) Those whom CHRIST appoints unto this task are sent with a specific message for a specific people even though each is sent to openly proclaim the truth of GOD. HE has a multitude which HE has appointed and is dependent upon no single one. (See I Sam. 14:6)
“HE chose five smooth stones. The LORD equips and prepares those whom HE sends. Stones are not naturally smooth. However when the LORD places them in a brook where they are tumbled and abraded against one another the passing of time wears off the rough edges. Some would dare to go into battle with unproven armor or that which is supplied by the learning of the flesh but GOD is pleased to prepare HIS stones and in the furnace of trial and affliction to teach them that all of their righteousness is HIS alone. GOD does not choose men based on their suitability for a task but rather HE is the ONE who makes them suitable. Those who are made suitable for this task are not the most eloquent nor the most learned as judged by men but those who are taught that all of their strength comes from HIM.
“HE chose five smooth stones. Stones are of little to no value. They have no power nor skill of their own let alone the ability to carry out any task. All of their usefulness is brought forth by the ONE who is pleased to use them as instruments of HIS glory. They can add nothing to the task at hand to which they are sent but are simply objects in the hand of HIM who slays giants and destroys principalities according to HIS own design.
“No giant can stand when CHRIST who chooses a stone and puts it in HIS sling lets it go with unfailing aim. It always finds its mark due to the skill of the SLINGER.”
– Excerpt from "Five Smooth Stones", by Mike McInnis, Grace Gazette, Volume VII, Issue 33