2 Bible Verses about Books, Metaphorical Use

Then I saw a great white throne, and him who was seated on it. 'The earth and the heavens fled from his presence; no place was left for them.' And I saw the dead, high and low, standing before the throne; and books were opened. Then another book was opened, the Book of Life; and the dead were judged, according to their actions, by what was written in the books.

So I went to the angel and asked him to give me the little book. And he said 'Take it, and eat it. It will be bitter to your stomach, but in your mouth it will be as sweet as honey.' I took the little book out of the angel's hand 'and ate it, and, while in my mouth, it was like the sweetest honey'; but, when I had eaten it, it was bitter to my stomach.