Albert Barnes Commentary Isaiah 29:12

"and the book is delivered to him that is not learned, saying, Read this, I pray thee; and he saith, I am not learned." — Isaiah 29:12 (ASV)

And the book is delivered ... - That is, they are just as ignorant of the true nature and meaning of the revelations of God as a man is of the contents of a book who is utterly unable to read.