Seneca, like many leading Romans of his day, found that larger moral framework in Stoicism,

Seneca, like many leading Romans of his day, found that larger moral framework in Stoicism, a Greek school of thought that had been imported to Rome in the preceding century and had begun to flourish there.

Seneca, (2018-02-26T22:58:59). How to Die: An Ancient Guide to the End of Life