Dead flies cause the ointment of the perfumer to send forth a foul odor: so does a little folly to him that is respected for wisdom and honor.
All Commentaries on Ecclesiastes 10:1 Go To Ecclesiastes 10
Gregory the Wonderworker
AD 270
Flies falling into perfume, and drowning, make the appearance and use of that pleasant oil unseemly; so, too, it is improper to have both wisdom and foolishness together in one’s mind.