( Story told by Swami Vivekananda )
A frog lived in a well. It had lived there for a long time. It was born there and brought up there, and yet was a little, small frog. Of course the evolutionists were not there to tell us whether the frog lost its eyes or not, but, for our story’s sake, we must take it for granted that it had eyes, and that it every day cleansed the waters of all the worms and bacilli that lived in it, with an energy that would give credit to our modern bacteriologists. In this way it went on and became a little sleek and fat — perhaps as much so as myself. Well, one day another frog that lived in the sea, came and fell into the well. “`Whence are you from?’
“`I am from the sea.’
“`The sea? How big is that? Is it as big as my well?’ and he took a leap from one side of the well to the other. “`My friend,’ says the frog of the sea, `how do you compare the sea with your little well?’ “`Then the frog took another leap and asked; `Is your sea so big?’ “`What nonsense you speak to compare the sea with your well.’ “`Well, then,’ said the frog of the well, `nothing can be bigger than my well; there can be nothing bigger than this; this fellow is a liar, so turn him out.’
Source : The Complete Works of Swami Vivekananda/Volume 7/Conversations And Dialogues/XXXIV