I Samuel 17:45

We were troubled on every side; without were fightings, within were fears.—Fear not: for they that be with us are more than they that be with them.—Strong in the Lord, and in the power of his might.

Thou comest to me with a sword, and with a spear, 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.—God is my strength and power: . . . he teacheth my hands to war; so that a bow of steel is broken by mine arms.—Our sufficiency is of God.

When I am weak, then am I strong.—God shall be my strength.—He said unto me, My grace is sufficient for thee: for my strength is made perfect in weakness. Most gladly therefore will I rather glory in my infirmities, that the power of Christ may rest upon me.—Let him take hold of my strength.

Cast thy burden upon the Lord , and he shall sustain thee.—The arms of his hands were made strong by the hands of the mighty God of Jacob.

Then said David to the Philistine, Thou comest to me with a sword, and with a spear, 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.

And David put his hand in his bag, and took thence a stone, and slang it. So David prevailed over the Philistine with a sling and with a stone.