"The frog in the well" logic illustrates that a frog residing in the atmosphere and boundary of a well cannot imagine the length and breadth of the gigantic ocean. Such a frog, when informed of the gigantic length and breadth of the ocean, first of all does not believe that there is such an ocean, and if someone assures him that factually there is such a thing, the frog then begins to measure it by imagination by means of pumping its belly as far as possible, with the result that the tiny abdomen of the frog bursts and the poor frog dies without any experience of the actual ocean. Similarly, the material scientists also want to challenge the inconceivable potency of the Lord by measuring Him with their froglike brains and their scientific achievements, but at the end they simply die unsuccessfully, like the frog.
Sometimes a materially powerful man is accepted as God or the incarnation of God without any knowledge of the factual God. Such a material assessment may be gradually extended, and the attempt may reach to the highest limit of Brahmājī, who is the topmost living being within the universe and has a duration of life unimaginable to the material scientist. As we get information from the most authentic book of knowledge, the Bhagavad-gītā (BG 8.17), Brahmājī's one day and night is calculated to be some hundreds of thousands of years on our planet. This long duration of life may not be believed by "the frog in the well," but persons who have a realization of the truths mentioned in the Bhagavad-gītā accept the existence of a great personality who creates the variegatedness of the complete universe. It is understood from the revealed scriptures that the Brahmājī of this universe is younger than all the other Brahmās in charge of the many, many universes beyond this, but none of them can be equal to the Personality of Godhead.