Ps. 40:7 Then said I, Lo, I come: in the volume of the book it is written of me.
"Then said he, Lo, or behold, I come. This he covenanted and passed his word for, before the foundation of the world. This was written or recorded of him in the volume of the book of God's eternal decrees and purposes - this was registered in the counsel and covenant of the Three in Jehovah - it was transcribed from thence into the volume of inspiration - it was the subject of all the types, of all the prophecies. This is a wonderful Lo! or Behold! It sets before us the very heart of Christ; how his whole soul rejoiced in doing the Father's will."
Samuel Eyles Pierce (1746-1829)
An Exposition of The Psalms (Psalm 40:7)