There were many gurus who taught me good things. But I could recollect few...just as I think through. During my Primary schooling, I wondered on seeing my Correspondent who was around 70 . He used to say that he did yoga regularly. I have seen him doing some difficult yoga posses just like that. Now I realize how difficult they are. During my High school studies, I admired on a Physics teacher. I will call him an intellect. He will just open the Chapter. Then he will flip the book on the table and just start narrating things as if it's a English story. He clarified doubts so easily, that even a kid will understand why/how it works. He will talk fluently on any subject..be it atomic physics, mechanics, electronics/electrical.