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Even out of context of the book, one can tell that Reuven's father is trying to teach Reuven a life lesson. The blink of an eye is typically a very short period of time during which nothing much can seem to happen. Yet, the eye that blinks represents the person behind the eye and indeed, people are what we should all pay attention to. Perhaps Reuven's father is trying to emphasize the importance of people first and foremost.