Stoicism was a school of Hellenistic philosophy founded in Athens by Zeno of Citium in the early 3rd century BC. The stoics considered destructive emotions to be the result of errors in judgment, and that a sage, or person of "moral and intellectual perfection," would control such emotions. Stoics were concerned with the active relationship between cosmic determinism and human freedom, and the belief that it is virtuous to maintain a will (called prohairesis) that is in accord with nature.

Because of this, the Stoics presented their philosophy as a way of life, and they thought that the best indication of an individual's philosophy was not what a person said but how he or she behaved. Later Roman Stoics, such as Seneca and Epictetus, emphasized that because "virtue is sufficient for happiness," a sage was immune to misfortune. This belief is similar to the meaning of the phrase 'stoic calm', though the phrase does not include the "radical ethical" Stoic views that only a sage can be considered truly free, and that all moral corruptions are equally vicious.

Stoic doctrine was a popular and durable philosophy, with a following throughout Greece and the Roman Empire, from its founding until the closing of all philosophy schools in 529 AD by order of the Emperor Justinian I, who perceived their pagan character to be at odds with his Christian faith. The Stoics provided a unified account of the world, consisting of formal logic, non-dualistic physics and naturalistic ethics. Of these, they emphasized ethics as the main focus of human knowledge, though their logical theories were to be of more interest for many later philosophers.

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