Who is a Guru? Is the one who teaches worldly education and properties of matter? No, they are only teachers. Is the one who teaches a mantra or Vedanata a Guru? No, we may call them Acharyas or scholars, but not Gurus. People consider a person who imparts knowledge as a preceptor. But most of them are mere teachers, not preceptors (Gurus).  A Guru is one who dispels darkness within us and moves us towards an enlightened state.