This quote beautifully captures the experience of engaging with a new book, portraying it as an invitation to exploration and discovery. The initial hesitation one might feel—“it won't bite... maybe a little”—reflects the universal nervousness when trying something unfamiliar. The imagery of a 'nip' or a 'tingle' conveys that the journey into reading is not just intellectually stimulating but also sensually enjoyable. It’s a reminder that the challenge of beginning something new is often deceptive; like learning to use a knife and fork, initial awkwardness gives way to mastery and comfort.

The metaphor of a book that "keeps on opening" and into which one may "fall in" suggests the immersive nature of literature—it expands horizons, introduces new worlds, and allows for infinite depth. The phrase "you'll never reach bottom" implies that knowledge and understanding through reading are boundless, a comforting thought that there's always more to learn, discover, and experience.

Finally, the closing line, "It's not like it's the end of the world—just the world as you think you know it," challenges preconceived notions and highlights the transformative power of reading. Books can change perspectives, bringing about a subtle but profound shift in how we perceive reality. In essence, this quote encapsulates the transformative joy of reading—the pleasure mingled with challenge, the endless possibilities, and the recalibration of one’s worldview.