The musts and shoulds are heavily tied up with perfectionism. For example, if you feel you must never fail, you are setting yourself up for a rollercoaster of emotions and a struggle with mood when you make a mistake or encounter a setback. We can strive for success and accept failures along the way. But when we set ourselves unrealistic expectations, we become trapped by them. That means we suffer whenever there is any sign that we may not be living up to them.
