Psalm 18:2 (ESV) … “The Lord is my rock and my fortress and my deliverer, my God, my rock, in whom I take refuge, my shield, and the horn of my salvation, my stronghold.”
“The Lord is my rock and my fortress.” Dwelling among the crags and mountain fastnesses of Judea, David had escaped the malice of Saul, and here he compares his God to such a place of concealment and security. Believers are often hidden in their God from the strife of tongues and the fury of the storm of trouble. The clefts of the Rock of Ages are safe abodes.
“My deliverer,” interposing in my hour of peril. When almost captured the Lord’s people are rescued from the hand of the mighty by him who is mightier still. This title of “deliverer” has many sermons in it, and is well worthy of the study of all experienced saints.
“My God;” this is all good things in one. There is a boundless wealth in this expression; it means, my perpetual, unchanging, infinite, eternal good. He who can say truly “my God,” may well add, “my heaven, my all.”
“My strength;” this word is really “my rock,” in the sense of strength and immobility. My sure, unchanging, eternal confidence and support. Thus the word rock occurs twice, but it is no tautology, for the first time it is a rock for concealment, but here a rock for firmness and immutability.
“In whom I will trust.” Faith must be exercised, or the preciousness of God is not truly known; and God must be the object of faith, or faith is mere presumption. “My buckler, warding off the blows of my enemy, shielding me from arrow or sword. The Lord furnishes his warriors with weapons both offensive and defensive. Our armoury is completely stored so that none need go to battle unarmed.
“The horn of my salvation,” enabling me to push down my foes, and to triumph over them with holy exultation. “My high tower,” a citadel high planted on a rocky eminence beyond the reach of my enemies, from the heights of which I look down upon their fury without alarm, and survey a wide landscape of mercy reaching even unto the goodly land beyond Jordan. Here are many words, but none too many; we might profitably examine each one of them had we leisure, but summing up the whole, we may conclude with Calvin, that David here equips the faithful from head to foot.