This lecture discusses key ideas from the ancient Stoic philosopher Seneca's Letters, this one looking at Letter 89

It focuses specifically what had by his time become a common way of dividing the discipline of philosophy - into Ethics, Physics, and Logic. He explains what each of these fields includes. He also discusses why other schools attempts to add more divisions or to get rid of one or two of the three divisions. The three fields can be subdivided further, and his treatment of Ethics by breaking it down into three main fields is different from the "three disciplines" that Epictetus distinguishes in his Discourses.

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