For me, 'Lamb' started out as a further exploration of the phenomenon of faith and the responsibility of a messiah that I touched on in 'Coyote Blue' and 'Island of the Sequined Love Nun,' but it ended up being an exploration of the true meaning of sacrifice, loyalty, and friendship.

This quote is saying that the author began their book ‘Lamb’ as a further exploration of the topics they covered in their earlier books ‘Coyote Blue’ and ‘Island of the Sequined Love Nun’, specifically faith and the idea that someone might be a messiah, and how that affects someone. However, it ended up also exploring the ideas of sacrifice, loyalty, and friendship, and what these mean in various contexts.