“In your book all my members were written . . .
when as yet there was none of them.”
The Son of God was declaring in this verse from Psalm 139 that God wrote the name of every member of the body of Christ in His Book of Life before there was a body of Christ. In the New Testament, this is confirmed for us by John when he said the names of those who are in Christ were written in God’s Book before the world began (Rev. 13:8; 17:8).
God knew you, and loved you, and wrote your name in His book a very long time ago. When you were born again into His family, He was very glad to finally have you actually be here. It was His good pleasure to give you His Spirit.