What did Stoic philosophers teach about the things humans cannot control?

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Stoic philosophers taught that humans should focus on what they can control, which is their own reason, virtue, and choices. Things outside of our control, such as wealth, health, and external events, are considered indifferent. The Stoics believed that true happiness comes from cultivating inner virtue and wisdom, rather than from external circumstances. By accepting what cannot be changed and focusing on one's own rational responses, individuals could achieve tranquility and resilience, even in the face of adversity. This perspective emphasizes personal responsibility for one's inner state, regardless of external conditions.1234