"How long do you want to wait until you demand the best from yourself?" – Epictetus. Often, in the stress of everyday life, we are overwhelmed by our emotions and do not know how to deal with our fears or rediscover our inner strength. Here, Stoic philosophy can be a great help. Even in ancient times, it was one of the most successful schools of life philosophy. Founded around 300 BC by Zeno of Citium and represented by great thinkers like Seneca, Marcus Aurelius, and Epictetus, it remains unmatched in its consistent way of conveying calmness and equanimity in the face of life's depths. This handbook, particularly suitable for beginners in the subject, presents the essential teachings of the key philosophers and provides insight into the historical background. The focus is on the practical application of Stoic principles. Jonas Salzgeber demonstrates how these principles can be applied to one's own life.