“Sacrifice and offering Thou didst not desire, mine ears hast Thou opened: burnt offering and sin offering hast Thou not required. Then said I, Lo, I come: in the volume of the book it is written of me, I delight to do Thy will, O my God: yea, Thy law is within my heart.” – Psalm 40:6-8. (compare: Hebrews 10:5-7)

We rejoice that the Lord Jesus Himself here speaks of Himself. Who but He can declare His own generation? Here He is both the subject of the words and the speaker also. The word is from Himself and of Himself, and so we have double reason for devout attention. He tells us what He said long ago. He declares, “Lo, I come.”

Here is a message worth the telling…Tell the Ethiopians, the Chinese, the Hindoos, and all the islands of the sea that God has come hither to save men, and has taken a prepared body, that He might give to God all He required, and all that He desired, that sinful men might be accepted in the Beloved, with whom God the Father is well pleased. Go, and take to the heathen this sacred Book. “In the volume of the book it is written of Him.” Do not begin to doubt the Book yourself. Why should you send missionaries to teach them about a book in which you do not yourself believe? Tell the nations that “In the volume of the book it is written of Him.” Believe this Book, and spread it. Help Bible societies, and all such efforts; and aid missionary societies, which carry the Book and proclaim the Savior. The men of the Book of God are the men of God, such as the world needs. Bid such men go and open the Book of God, and teach the nations its blessed news. Go, dear friends, and assure the heathen that there is happiness in obedience to God. So the Savior found it. He delighted in God’s will, even to the death, and they will also know delight as in their measures they bow before the authority of the Word and the will of the one living and true God, the God of Abraham, of Isaac, and of Jacob. Jehovah, the I AM, must be worshiped, for beside Him there is none else. Give glory unto God, whom our Lord Jesus has come to glorify. Amen. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2202.cfm