Letter 90 is believed to belong to the so-called Encouraging philosophical discourses, similar to those written by Aristotle, Cicero, Iamblichus, and others to praise philosophy and encourage young people to engage in its study.
Indeed, in Letter 90, Seneca, taking as a pretext his disagreement with Poseidonius on a specific issue, proceeds to a general praise of philosophy; however, this praise is woven in contrast to the corresponding, albeit latent, praise of Poseidonius, the core of which Seneca largely rejects.
Since it extols philosophy, Letter 90 certainly has elements of an encouraging discourse, but it is not written as a pure Encouraging treatise, since its main aim is, I believe, to refute Poseidonius's views.
[Excerpt from the introduction text of the edition]
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