"Ancient philosophy (indeed, philosophy generally) is typically marked by a refusal to leave things opaque and puzzling, to seek to make them clearer and more transparent to reason. Hence reading ancient philosophy tends to engage the reader’s reasoning immediately, to set a dialogue of minds going.
"Ancient philosophy is sometimes taught as a procession of Great Figures, whose ideas the student is supposed to take in and admire. Nothing could be further from its spirit. When we open most works of ancient philosophy, we find that an argument is going on – and that we are being challenged to join in."