A professor holds up a glass of water in class and asks students to guess its weight. After various guesses, the professor notes they don't actually know unless they weigh it. The professor asks what would happen if he held it up for an hour, then a day. The students note his arm would ache after an hour and he may need to go to the hospital after a day. However, the professor notes the weight of the glass did not change. He explains that life's problems are like the glass - they seem manageable at first but can paralyze us if dwelled on for too long. The professor advises students to "put the glass down" by not stressing over challenges at the end of each day so