Wizard's First Rule by Terry Goodkind

In a world where magic is both wondrous and perilous, a young woods guide named Richard Cypher embarks on a monumental quest after his father's murder leads him to the discovery of his own latent magical abilities. Guided by a mysterious woman named Kahlan and a wizard named Zedd, Richard must navigate treacherous lands and confront a malevolent tyrant who seeks to enslave the world. As he grapples with his destiny as the Seeker of Truth, he learns that love, like magic, comes with a price, and that the titular rule—trust no one—may be the most important lesson of all. The 6781st greatest book of all time