The professor holds up a glass of water in class and asks students to guess its weight. When the students provide guesses, the professor notes that he doesn't actually know the weight unless he measures it. He then asks what would happen if he held the glass up for longer periods of time - an hour, a day. The students note that his arm would begin to ache and could become numb. However, the professor notes that the weight of the glass did not change. He asks what caused the pain, and a student responds that he should put the glass down. The professor explains that life's problems are like the glass - they seem manageable at first but can paralyze us if dwelled on for too long. It