-Page numbers are available for citation. Because they were added to text "manually" by hyperlink , readers can access them from all devices (old generation kindle, ios, etc..) with no problem.

-Word index was added for frequent words.

-All indexes have letter shortcuts.

-Footnotes are bi-directional.

-A brief guide to stoicism was added (about philosopher, further reading , websites, etc.). See appendix.

Purpose of Stoicism Series submit best digital edition of primary books for reader who wants to study Stoicism.