In this quote from Seneca, he emphasizes the importance of maintaining humility during prosperous times to avoid suffering when faced with hardships. Those who remain grounded and don’t become arrogant during good fortune are less likely to be devastated by changes in circumstances. It highlights the idea that a rational and stable mind is crucial for enduring life's ups and downs.
Seneca suggests that true strength is demonstrated not just in moments of joy, but in how individuals respond to adversity. A composed individual maintains their integrity and mental fortitude, reinforcing the Stoic belief that a balanced mindset enables one to confront challenges effectively. This resilience forms the foundation of a wise and fulfilling life.