Compared to other species, human beings are certainly endowed with good intelligence, yet unless they are devotees of the Lord, all their thinking is limited within mundane boundaries. Therefore it is impossible for the mundane mind to approach the transcendence. But instead of surrendering to the Supreme Lord or His representative, the empirical philosophers try to explain away as "unmanifest" that which is beyond their mundane minds. This is known as the logic of the frog in the well.
No matter how big a thinker a tiny living entity may be, all his activities are limited by mundane boundaries, just as a frog in the well can never comprehend that such a thing as an ocean exists outside his little domain. He refuses to acknowledge that a mass of water infinitely bigger than his tiny puddle can at all be possible. Similarly, we are trapped in the dark well of our body and mind. And although we may try hard through yoga or empirical speculation to overcome our limitations, no matter how erudite we are it is impossible to reach beyond the limitations of our self-made well.
So, who can bring us news of the great ocean? Is there any record of how long we have been struggling in the water to stay afloat in the well of this material world, sometimes going up to the higher planets, sometimes coming down? Only the Supreme Lord Himself or His empowered representative can possibly free us from confinement in this dark well. Under their guidance we can come to know of the limitless ocean of the spiritual sky. This process—hearing from higher authorities—is called the deductive, or descending, process of knowledge. It is the only authorized way to learn transcendental knowledge. By this method alone is eternal truth transmitted.