Arjuna he was personal friend of Kṛṣṇa. Just try to understand how much qualified he was. Not only that; he belonged to the royal family, he was a great warrior, great hero, so many qualities. But he said that, "I cannot practice this yoga system. It is not possible. I cannot control my mind and practice this haṭha-yoga system." Now just try to understand. He is such a personality, great personality, and five thousand years ago, when things were so nice. So at that time a person like Arjuna felt that he's unable to practice this yoga system. And nowadays a paltry people with teeny knowledge, they are trying to practice yoga system as if they're . . . he has become more than Arjuna.
It is very difficult subject matter. It is not possible for ordinary man. The first principle is that he has to sit down alone in a sacred place, alone. yoga practice is not possible in a big city, with friends and smoking habit and drinking habit. This all farce. One has to become very strong in controlling the mind, controlling the senses, sitting in a solitary place, sacred place like Himalaya or Haridwar, like that. And who is going there, and who is practicing? It is not possible.