Then said I: i.e. at Incarnation, when He "came into the world" (Hebrews 10:5).
volume of the book. scroll, that is to say, the book. Genitive of Apposition, and Figure of speech Pleonasm (App-6). the book of the law (App-47).
it is written. it is prescribed. Compare 2 Kings 22:13.
of me. for me. Joseph and Mary should have remembered what was "written" (Luke 2:49).