Instruct: Classify Amazon reviews into positive or negative sentiment
Query: classics, gems, masterpieces

These are masterpieces of their genre. They are very readable. I got a boxed set when I was in high school, and read every single book. They are far deeper than the Christian symbolism some would say. Study the last book very carefully- he is talking about something Thomas Banyacya, the Hopi elder, talks about, a time when only those whose hearts and heads are joined will survive. This series has influenced other books, notablyThe Chronicles of Chrestomanci, Volume 1: Charmed Life / The Lives of Christopher Chant. It has portals, the other worlds of Quantum Mechanics, there's quite a bit here, under a great story.