This world is so large. It is impossible for us to imagine how vast the solar system is. There are stars whose light hasn't even reached us yet. We can't even imagine the limits of the galaxies. A person who thinks that he knows everything is so full of pride that he is not willing to bow his head to anyone. He refuses to realize the truth. There is a good example of this in the Ramayana. When Lord Rama succeeded in breaking the bow of Shiva, Parashurama arrived, extremely angry. He wanted to know who had broken the bow. He didn't stop to think that someone who could break that bow could not be an ordinary man, that he must have superior powers. He simply flew into a rage and swore revenge.
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