2 Bible Verses about Books, Metaphorical Use

And I saw a great white throne, and him that sat thereon, from whose face the earth and the heaven fled away; and there was found no place for them. And I saw the dead, great and small, standing before the throne; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of the things that were written in the books, according to their works.

And I went to the angel, saying to him, Give me the little book. And he saith to me, Take and eat it up, and it will make thy belly bitter, but it will be sweet as honey in thy mouth. And I took the little book out of the angel's hand and ate it up, and it was in my mouth sweet as honey, but when I had eaten it, my belly was bitter.