Adam Clarke on Job 31:35

O that one would hear me! - I wish to have a fair and full hearing: I am grievously accused; and have no proper opportunity of clearing myself, and establishing my own innocence.

Behold, my desire is - Or, הן תוי hen tavi, "There is my pledge." I bind myself, on a great penalty, to come into court, and abide the issue.

That the Almighty would answer me - That he would call this case immediately before himself; and oblige my adversary to come into court, to put his accusations into a legal form, that I might have the opportunity of vindicating myself in the presence of a judge who would hear dispassionately my pleadings, and bring the cause to a righteous issue.

And that mine adversary had written a book - That he would not indulge himself in vague accusations, but would draw up a proper bill of indictment, that I might know to what I had to plead, and find the accusation in a tangible form.