[View Handbook] For the Stoics, the only thing that we have complete control over is our thoughts. It’s normal that we are constantly bombarded with perceptions because our brain is designed by nature to scan everything that we sense in the external world. This so-called “flight-or-fight” response is the same instinct we share with other animals that Mother Nature designed for our own survival. For example, if somebody tries to say something that would endanger our…