So yoga siddhi, these wonderful things are there. Similarly, one can walk on the water. He'll not be drowned. He becomes so light he can float in the air. These are . . . so siddhya. Siddhya means that the persons who reside in that planet, they have got automatically, by taking birth in that . . . just like taking birth in the Western countries, America or Europe, you are more opulent than other countries materially. Similarly, in Kṛṣṇaloka also, those who are there, they are automatically all lover of Kṛṣṇa. Similarly, there are many different planets, different kinds of residents. We . . . what knowledge we have got?
But we have to take knowledge from the śāstra. Therefore Vedānta-sūtra says, śāstra-cakṣuṣat. You have to understand, you have to gather your knowledge from authentic scripture, not by experimental knowledge. Experimental knowledge cannot be perfect because our instruments of acquiring knowledge are imperfect. So however we may tackle these instruments perfectly in our way, basically they are imperfect. Therefore perfect knowledge you cannot have.
If you want to have perfect knowledge, then you have to understand this authoritative scripture. Just like here, in this Śrīmad-Bhāgavatam, we understand that there is Brahmā, or the demigods, and the siddhaḥ. So we have to accept. You cannot understand these things by experimental knowledge. Simply as it is. Therefore I am presenting this Bhagavad-gītā As It Is. Then you understand. That is knowledge, perfect knowledge. Otherwise, if you interpret, if you don't believe, then you don't get. There is no other way.