We have Seneca's philosophical or moral essays (ten of them traditionally called Dialogues)—on providence, steadfastness, the happy life, anger, leisure, tranquility, the brevity of life, gift-giving, forgiveness— and treatises on natural phenomena. Also extant are 124 epistles, in which he writes in a relaxed style about moral and ethical questions, relating them to personal experiences; a skit on the official deification of Claudius, "Apocolocyntosis" (in Loeb number 15); and nine rhetorical tragedies on ancient Greek themes. Many epistles and all his speeches are lost.
His moral essays are collected in Volumes I-III of the Loeb Classical Library's ten-volume edition of Seneca.
eBook Moral Essays, Vol 1