Bitterness is an emotion that everyone knows as a reaction to injustice, insult, devaluation, or betrayal of trust. Almost everyone has been able to observe bitterness in themselves or in others. Bitterness can occur temporarily, like other emotions, but it can also be very intense and life-altering. When it dominates a person's life and they can no longer detach themselves from negative life events, help is needed.

This guide first explains what bitterness is and what triggers it. The book aims to help those affected to overcome bitterness and learn to deal better with hurtful situations, especially regarding the future. To this end, a problem-solving method is presented that particularly references wisdom psychology and wisdom competencies, such as factual and problem-solving knowledge, perspective-taking, self-relativization, and emotional empathy. It is scientifically proven that wisdom is an "antidote" to bitterness. The guide is directed not only at those affected but also at their relatives and friends, as well as people from the work environment. They receive guidance on how to support those affected in no longer remaining stuck in their bitterness.