The yoga-siddhi you can get when you become perfect yogī. Mahimā also. You can float in the air. That is called laghimā. Now the aeroplane is going in the air very good speed, but when you get yoga-siddhi, your speed becomes. . . You become very light. You can go anywhere in a moment. It is speedier than the mind. Just like mind—you are sitting here, and your paternal home may be ten thousand miles away, but by mind you can go immediately. This is mental speed. You cannot take your body immediately there, but you can take your mind there immediately. So why it is possible? Because mind is finer than this gross body. That is stated in the Bhagavad-gītā, indriyāṇi parāṇy āhur indriyebhyaḥ paraṁ manaḥ, manasas tu parā buddhiḥ (BG 3.42). The finer, finer, finer. Just like this gross body, this gross body means senses. The finer than this is the mind.
So yoga system means to control the mind. By controlling mind, you can control the senses, because mind is the master of the senses. Then above mind, still finer, is the intelligence. So you can train up your mind with intelligence. That is the best intelligence, when one engages the mind in Kṛṣṇa consciousness. Then you will get instruction from the Supreme Personality of Godhead, sitting anywhere. So these things can be understood gradually after purifying the mind. At the present moment, on account of our material contamination, our mind is contaminated with so many material things. If you purify your mind, then you come to the spiritual platform. That is intelligence, via media between the spirit and the mind. First of all body; finer than the body is mind. Then finer than the mind is the intelligence, and finer than the intelligence is the soul. So if you keep your mind always engaged at the lotus feet of Kṛṣṇa, then it becomes purified.
So this is the movement of Kṛṣṇa consciousness - how to fix up the mind always at the lotus feet of Kṛṣṇa. And it is called bhakti-yoga. So if you practice this bhakti-yoga, then everything will be perfect in your life. We are spreading this bhakti-yoga all over the world, and here is one of the centers. You take advantage of it. It is not sentimental; it is authorized on scientific basis, philosophical basis. So we have got so many books, about fifty books about this Kṛṣṇa consciousness movement. You can read them. You can ask the devotees if you cannot understand, and chant Hare Kṛṣṇa and make your life perfect.