Taking Seneca's presence in philosophy of life as a starting point, this article explores in a panoramic way his critical incorporation into phenomenology as practical philosophy, his influence as an art of living in the development of philosophy as a way of life and in the aesthetics of existence, and his impetus in modern Stoicism, between therapeutic philosophy and self-help literature, showing how the transformation of Stoic philosophy has taken place and to what extent, although his concerns were very different from ours, Seneca's thought lives on today.