This lecture discusses key ideas from the ancient Stoic philosopher Seneca's Letters, this one looking at Letter 58

It discusses several important issues in metaphysics, spurred by considering 6 different types of things Plato is said to have considered to be beings or to have being. Seneca begins with some considerations about the Latin and Greek languages, about about the terms essentia, ousia, to on, and quod est, and then discusses what genera and species are, and how they are arranged in relation to each other. He then discusses the 6 types of being Plato is said to have distinguished, and why individual material things are not really beings - not only from a Platonic, but also a Stoic perspective.

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