The broaden-and-build theory

Instead of punishing yourself for making a mistake, Schafler writes it is more effective to practice self-compassion. In her book she references the broaden-and-build theory, a positive psychology theory that was developed by social psychologist Barbara Fredrickson in 1998. 

Broaden-and-build theory suggests that when you're in a positive headspace you feel more able to face different challenges and make choices based on the possibility of positive outcomes.