In The Upside of Your Dark Side, two pioneering researchers in the field of psychology show that while mindfulness, kindness, and positivity can take us far, they cannot take us all the way. Sometimes, they can even hold us back. Emotions like anger, anxiety, or doubt might be uncomfortable, but it turns out that they are also incredibly useful.For instance:• Anger fuels creativity• Guilt sparks improvement• Self-doubt enhances performance• Selfishness increases courage• Mindlessness leads to better decisionsThe key lies in what the authors call “emotional agility,” the ability to access our full range of emotions—not just the “good” ones—in order to respond most effectively to whatever situation we might encounter.