Almost the end!

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I have gone through my life, as well as others, counting down until the end of events. Whether it's the end of a class, the end of a work day, the end of the year, or the end of a phase of one's life. I bet many people, when they were in grade school or high school, counted down the number of days left in school; till school ended. Reflecting on this way of viewing events, I recognize that this may be somewhat pessimistic. Why should we be looking forward to the end of something?