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What is significant in one's own existence one is hardly aware, and it certainly should not bother the other fellow. What does a fish know about the water in which he swims all his life?

Albert Einstein (2011). “Out of My Later Years: The Scientist, Philosopher, and Man Portrayed Through His Own Words”, p.8, Open Road Media
What is significant in one's own existence one is hardly aware, and it certainly should not bother the other fellow. What does a fish know about the water in which he swims all his life?