Ursula Le Guin is the daughter of Alfred Kroeber, an anthropologist, and Theodora Kroeber, a psychologist and writer. It's easy and accurate to say that her parents' interests inform her brilliant writing, and that cultural anthrpology and Jungian psychology are at the core of Wizard of Earthsea and its three sequels.
But the book isn't a treatise. It's a wonderful, well-told story of a young man, Ged, coming of age in a world where words can have the power of magic and dragons are as real as earthquakes. There is nothing didactic about this story; Le Guin's writing is compelling and her characters are vivid: Ogion, the Mage of Silence, whose word had stilled an earthquake; Vetch, who helps Ged on a deadly quest for no reason but friendship; Murre, Vetch's sister; Yevaud, the dragon of Pendor; and Skiorh, possessed by a gebbeth.
Earthsea doesn't exist in a vacuum. Le Guin constructs a deep and textured history, and her characters act in ways that are consistent with that world. She manages the trick of writing a mythic tale without falling into the traps and foibles of sounding like you are trying.
The climax is straight from Carl Jung, but you don't need to know Carl Jung from Steve Young to appreciate it.
From time to time, religious groups call for this book to be banned from school libraries, claiming it promotes witchcraft. Nonsense. This is a book every teenager should read. It speaks to self-understanding, nothing more.
And some feminists criticize Le Guin because Ged is a male character. Again, nonsense, Ged is an archetype, and his gender matters not at all.
This is an important book. It's also terrific fun. Highly recommended.