He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love.
While Israel was still wandering in the desert of Sinai, Moses told them, “The Lord did not set His love on you or choose you because you were more in number than any other people, for you were the least of all peoples; but because the Lord loves you, and because He would keep the oath which He swore to your fathers, the Lord has brought you out with a mighty hand, and redeemed you from the house of bondage, from the hand of Pharaoh king of Egypt” (Deut. 7:7–8). God did not choose the Jews because of who they were but because of who He is.
The same is true of God’s choosing believers. He chooses solely on the basis of His divine will, purpose, and love. There’s nothing you did to earn or gain salvation; it’s all of God. Be thankful that He chose you from before the foundations of the world.