Direct perception is speculation. Dr. Frog. Dr. Frog is speculating what is Atlantic Ocean. He is in the well, three-feet well, and some friend inform him, "Oh, I have seen vast water." "What is that vast water?" "Atlantic Ocean." "How big it is?" "Very, very big." So the Dr. Frog is thinking, "Maybe four feet. This well is three feet. It may be four feet. All right, five feet. Come on, ten feet." So in this way, speculating, how the frog, Dr. Frog, will understand Atlantic Ocean or Pacific Ocean? Can you estimate the length and breadth of the Atlantic, Pacific Ocean by speculation? So by speculation you cannot have. They are speculating so many years about this universe, how many stars are there, what is the length and breadth, where is the . . . nobody knows anything even of the material world, and what to speak of the spiritual world. That is beyond, far beyond.
Paras tasmāt tu bhāvo 'nyo 'vyakto 'vyaktāt sanātanaḥ (BG 8.20), you'll find in the Bhagavad-gītā. There is another nature. This nature, what you see, the sky, a round dome, this, that, above that, there are layers of five elements again. This is the covering. Just like you have seen the coconut. There is hard covering, and within the covering there is water. Similarly, within this covering . . . and outside the covering there are five layers, thousand times bigger than the one another: water layer, air layer, fire layer. So you have to penetrate all these layers. Then you will get the spiritual world. All these universes, unlimited number, koṭi. Yasya prabhā prabhavato jagad-aṇḍa-koṭi (Bs. 5.40). Jagad-aṇḍa means the universe. Koṭi, many millions clustered together, that is material world. And beyond that material world there is spiritual world, another sky. That is also sky. That is called paravyoma. So by your sense perception you cannot estimate even what is there in the moon planet or sun planet, this planet, within this universe. How you can understand the spiritual world by speculation? This is foolishness.