“He calls the "roll of the book" every divinely inspired Scripture, both the legal and the prophetic. In these Scriptures things are written concerning the memory of the Savior among us. The psalmist calls it a roll because everything is summed up into one.”
Didymus the Blind, 4th c. — FRAGMENTS ON THE PSALMS 40:8
Original
7Then said I, Lo, I come: in the volume of the book it is written of me,
Modern
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In context
5Many, O LORD my God, are thy wonderful works which thou hast done, and thy thoughts which are to us-ward: they cannot be reckoned up in order unto thee: if I would declare and speak of them, they are more than can be numbered.
6Sacrifice and offering thou didst not desire; mine ears hast thou opened: burnt offering and sin offering hast thou not required.
— Psalms 40:7 —
8I delight to do thy will, O my God: yea, thy law is within my heart.
9I have preached righteousness in the great congregation: lo, I have not refrained my lips, O LORD, thou knowest.