"Of those things only should one be afraid Which have the power of doing others harm; Of the rest, no; because they are not fearful"

(Canto 2, lines 88-90)

This passage seems to derive from Aristotle's "Nichomachean Ethics" and its discussion on what things should be feared. However, Dante is believed to have been ignorant of Greek, and his allusions to ancient Greek classics were therefore borrowed through Latin translations.