I can’t even fathom what this verse means. I have no reference for “before time began”. But God could see into the world He was about to create and extend to me grace, salvation and a calling through His Son, whose work to save me was determined already.
God must think a great deal about us. From eternity past, He was able to see all of our time in a moment, down to the very thing you are doing right now. Every life was before Him before He had even uttered the first “Let there be”!
But God has both seen all our doings and still called us to salvation by His grace. You are not insignificant. But you matter to God, and since before time began.
God bless you today!