The quote from Peter S. Beagle's "The Last Unicorn" emphasizes the profound personal sacrifice required for genuine magic. It suggests that true achievement or transformation cannot come from using the resources or sacrifices of others; instead, one must invest their own essence and will. This idea of tearing out one's own liver is a metaphor for the deep, often painful commitment necessary to create something real and meaningful.

Furthermore, the mention of "true witches" indicates that this understanding is inherent to those who engage deeply with magic or creativity. They recognize that real power comes not from shortcuts or exploiting others, but from a willingness to give of oneself entirely, facing the risks and uncertainties that accompany such a journey. This passage reflects a deeper truth about the nature of sacrifice and commitment in any meaningful endeavor.