Who is a true Guru? Is he the one that teaches worldly education? Is he one that that explores properties of matter? No, they are only teachers. Is one who teaches a manthra or Vedanata a Guru? No, we may call them Acharyas, not Gurus. People consider a person who imparts knowledge as a preceptor. But most of them are mere teachers, not preceptors (Gurus). A teacher who teaches others has had a teacher himself. The one who has no Guru above him is the true Guru. …
Source: WHO IS THE REAL GURU?