1911 Encyclopædia Britannica (1911)
“ After his return from Persia Simplicius wrote commentaries upon Aristotle's De coelo, Physica, De anima and Categoriae, which, with a commentary upon the Enchiridion of Epictetus, have survived. Simplicius is not an original thinker, but his remarks are thoughtful and intelligent and his learning is prodigious. To the student of Greek philosophy his commentaries are invaluable, as they contain many fragments of the older philosophers as well as of his immediate predecessors. ”
