Σενέκας, or Seneca, was a Roman philosopher and playwright known for his contributions to Stoicism, a school of thought that emphasizes rationality and self-control. Stoicism teaches that individuals should focus on what they can control and accept what they cannot, promoting inner peace and resilience in the face of adversity. The core principles of Stoicism include the importance of virtue, wisdom, and the pursuit of a good life through ethical behavior. Stoics believe that emotions should be managed through reason, allowing individuals to maintain tranquility regardless of external circumstances. This philosophy has influenced many thinkers and continues to be relevant today.