How heavy is this glass of water?

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A lecturer raised a glass of water in his hand, extended his arm and asked "How heavy is this?" Answers ranged from 300g to 500g. The lecturer replied "The absolute weight doesn't matter. It depends on how long I try and hold it. If I hold it for a minute that's not a problem. If I hold it for an hour, I'll have an ache in my arm. If I hold it for a day, you'll have to call an ambulance. In each case it's the same weight, but the longer I hold it the heavier it becomes. So, where does this apply in life? To an unkind comment someone may once have made about you. To a time in your life when you didn't act as well as you could have done. To a disappointment you experienced when an expectation of yours was not met. To a difficult childhood, a divorce, a job loss, you can fill in the rest. The burden gets heavier the longer you carry it. You either say goodbye to the past or you say goodbye to the future.