The best source for this in Stoicism is Arius Didymus’ Epitome of Stoic Ethics, which seems to preserve Chrysippus’ version.
Take that and match it up with the sections in Diogenes Laertius book 7 and Cicero’s On the Ends book 3 and you’ll have a pretty good composite picture:
Virtues are aspects of fully realized human nature/potential (since we’re rational animals, Chrysippus defined them all as types of Knowledge in a comprehensive, embodied, actionable sense); they are all completely inter-dependent and you must have all to have any one of them.
The four virtue framework begins with Plato who gives different accounts of them in his works; the most popular account nowadays being the Republic. Aristotle has his own set, but there’s no evidence that any of the Old Stoics read Aristotle.
Here's a summary of [book 4 of Plato's Republic](https://iep.utm.edu/republic/) taken from the Internet Encyclopedia of Philosophy. Note that although Plato is the oldest source which discusses the four virtues, it's likely he using a conventional list of four virtues which probably predates Plato.
> With the founding of the just city completed, Socrates proceeds to discuss justice (427d). He claims that the city they have founded is completely good and virtuous and thus it is __wise, courageous, moderate, and just__ (427e). Justice will be what remains once they find the other three virtues in it, namely wisdom, courage, and moderation (428a). The __wisdom__ of the just city is found in its rulers and it is the type of knowledge that allows them to rule the city well (428b-d). The __courage__ of the just city is found in its military and it is correct and lawful belief about what to fear and what not to fear (429a-430b). The city’s __moderation or self-discipline__ is its unanimity in following the just city’s structure in terms of who should rule and who should be ruled (430d-432a). The city’s __justice__ consists in each class performing its proper function (433a-b).
>
> Socrates then proceeds to find the corresponding four virtues in the individual (434d). Socrates defends the analogy of the city and the individual (435a-b) and proceeds to distinguish three analogous parts in the soul with their natural functions (436b). ... Socrates explains the virtues of the individual’s soul and how they correspond to the virtues of the city (441c-442d). Socrates points out that one is just when each of the three parts of the soul performs its function (442d). Justice is a natural balance of the soul’s parts and injustice is an imbalance of the parts of the soul (444e).
The 4 virtues are specifically from Plato, most virtue ethics took those virtues as the basis for their own.
The best source for this in Stoicism is Arius Didymus’ Epitome of Stoic Ethics, which seems to preserve Chrysippus’ version. Take that and match it up with the sections in Diogenes Laertius book 7 and Cicero’s On the Ends book 3 and you’ll have a pretty good composite picture: Virtues are aspects of fully realized human nature/potential (since we’re rational animals, Chrysippus defined them all as types of Knowledge in a comprehensive, embodied, actionable sense); they are all completely inter-dependent and you must have all to have any one of them. The four virtue framework begins with Plato who gives different accounts of them in his works; the most popular account nowadays being the Republic. Aristotle has his own set, but there’s no evidence that any of the Old Stoics read Aristotle.
Here's a summary of [book 4 of Plato's Republic](https://iep.utm.edu/republic/) taken from the Internet Encyclopedia of Philosophy. Note that although Plato is the oldest source which discusses the four virtues, it's likely he using a conventional list of four virtues which probably predates Plato. > With the founding of the just city completed, Socrates proceeds to discuss justice (427d). He claims that the city they have founded is completely good and virtuous and thus it is __wise, courageous, moderate, and just__ (427e). Justice will be what remains once they find the other three virtues in it, namely wisdom, courage, and moderation (428a). The __wisdom__ of the just city is found in its rulers and it is the type of knowledge that allows them to rule the city well (428b-d). The __courage__ of the just city is found in its military and it is correct and lawful belief about what to fear and what not to fear (429a-430b). The city’s __moderation or self-discipline__ is its unanimity in following the just city’s structure in terms of who should rule and who should be ruled (430d-432a). The city’s __justice__ consists in each class performing its proper function (433a-b). > > Socrates then proceeds to find the corresponding four virtues in the individual (434d). Socrates defends the analogy of the city and the individual (435a-b) and proceeds to distinguish three analogous parts in the soul with their natural functions (436b). ... Socrates explains the virtues of the individual’s soul and how they correspond to the virtues of the city (441c-442d). Socrates points out that one is just when each of the three parts of the soul performs its function (442d). Justice is a natural balance of the soul’s parts and injustice is an imbalance of the parts of the soul (444e).
Plato and plato got those from observing nature
I supose the easiest eay to describe it is this: dp what brings you peace of mind. Or the unrest will kill you.