Before the mountains were brought forth, or ever you had formed the earth and the world, from everlasting to everlasting you are God.
When I was a young guy, I could remember attempting to comprehend the vast universe. I then found myself building a brick wall to enclose the entire area. The idea of the universe expanding forever was inconceivable to me.
I also struggle with time in the same way. Time affects almost everything I do since I am a creature that exists in time. My existence is defined by the minutes, hours, days, weeks, years, and decades. Years in the thousands, millions, and billions. I have no idea what a billion years entails. It's simply too large.
Moses said in the scripture," from everlasting to everlasting, you are God." When time began, he was God. When the time comes to an end, he will still be God. Unchanging in nature. Unchanging in purpose. Eternal.
At first, this may seem a minor incident in Abraham's life, but at Beersheba, we see that Abraham calls on the LORD as El Olam, "the Everlasting God" or "Eternal God." The Hebrew word Olam means "for a long time, always, forever." El Olam thus reveals God as "the Everlasting God," without beginning or end. God has no beginning and no end.
The question is, when did God appear? The answer is that God did not "begin" but has always existed and will continue to exist. He is eternal from the beginning of time to the end of time. You are God, and He has no beginning and no end. He existed before He formed the mountains and created the earth and universe.
This is not just something the Bible says. It's also a logical requirement there has to be one uncreated and uncaused "something" to start everything else.
Paul exclaims. How impenetrable are His judgments and ways past discovering He is the only being on the planet who does not owe His existence to someone else?
He is independent of any other being or cause. He exists outside of the entire chain of causes and effects. He is uncreated, unborn, and without beginning, and He owes His existence to no one other than Himself.
Similarly, the book of Job teaches that "the number of God's years is unsearchable." Our God is not constrained by time as we are. He has no beginning and no end, like a circle. It's difficult to understand how someone can exist outside of time, but God sees all of human history.
The human being can only be in one place at a time, but such limitations do not apply to God. He knows what you did yesterday, what you're doing now, and what you'll do tomorrow simultaneously.
What about when the world ends? God will still be God. He's always been there. His existence extends indefinitely into the past and the future. There was never a time when He did not exist, and He will never cease to exist. He is not constrained by it. Everything is present to Him. As a result, He can predict what will happen because it is not the future of Him.