Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God. Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting thou (art) God. As man's weakness is connected with his mortality, so God's omnipotence follows necessarily from His eternity. "The mountains," by their majestic height and unshaken stability, give the impression of antiquity and unchangeableness. Compare Genesis 49:26, "the everlasting hills;" Deuteronomy 33:15; Habakkuk 3:6. "The earth" is this globe below, in contrast to the heavens above. "The world" х teebeel (H8398)] is the habitable earth, the fruit-bearing earth, as contrasted with the sea (Psalms 24:1, note). The earth was created on the second day; the habitable earth or 'dry land' [the prose Hebrew term, yabaashaah (H3004)] on the third day (Genesis 1:6-13; Psalms 104:5-9). God was not merely before the mountains, the earth, and the world, but He was their Creator. His eternity implies His omnipotent Creatorship; because the things which came into being after Him could not originate themselves. So in Isaiah 44:6, from the eternity of Yahweh, His being the only God is deduced, "I am the First, and I am the Last, and beside me there is no God."
Thou (art) God - rather, 'thou (art) O God.' The context require us to understand that what is predicated of God is, that He is "from everlasting to everlasting," whence follows His omnipotence; in contrast to man's mortality, whence follows his weakness.