The answer is: He ate it

Rev 10 vs 10

In the Book of Revelation, the "little book" that John took from the angel carries quite a bit of weight, both literally and metaphorically. When John eats the book, he's engaging in a profound act that symbolizes the absorption of divine knowledge and prophecy. The taste of the book being sweet in his mouth but bitter in his stomach could reflect the dual nature of prophetic revelation—sometimes it can be exhilarating and uplifting, yet the realities it reveals can be harsh and difficult to digest.

The imagery of consuming a book has rich roots in ancient traditions. In one sense, it parallels the Jewish custom where prophets during ancient times were sometimes asked to embody God's messages fully, integrating these truths into their being. You might recall the prophet Ezekiel having a similar experience, where he was instructed to eat a scroll— a potent reminder of how deeply spiritual truths can affect us.

As an intriguing side note, angels deliver messages and packages in several other biblical narratives too! Take Gabriel, for instance, who brings news of births and significant events. Each time, there's this underground current highlighting the communication between the divine and humanity—a reminder of the interconnectedness of all existence.

When John fills himself with this divine wisdom, it sets him on a path to further revelations, emphasizing that understanding the sacred can be both enlightening and challenging. Embracing the entirety of divine truths allows for growth and deeper insights, though the journey won't always be easy!