The Stoics also held that certain destructive emotions resulted from errors of judgment, and they believed people should aim to maintain a will (called prohairesis) that is "in accordance with nature." Because of this, the Stoics thought the best indication of an individual's philosophy was not what a person said but how a person behaved.[2] To live a good life, one had to understand the rules of the natural order since they thought everything was rooted in nature.