Plato thought that only philosophy can bring true understanding because it alone examines the presuppositions and assumptions that other subjects merely take for granted. He conceived of philosophy as a single discipline defined by a distinctive intellectual approach, and capable of carrying human thought far beyond the realms of common sense or everyday experience. The unrivalled scope and incisiveness of his writings as well as their enduring aesthetic and emotional appeal have captured the hearts and minds of generation after generation of readers. Unlike the thinkers who preceded him, Plato never spoke with his own voice. Instead, he presented readers with a variety of perspectives to engage with, leaving them free to reach their own, sometimes radically different, conclusions. `No one', he said, `ever teaches well who wants to teach, or governs well who wants to govern.'