Chrysippus
Third head of the Stoic school. Systematized Stoic philosophy and is often considered the second founder of Stoicism.
Chapter I (The Six Days of Creation)
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Verse 24: Let the Earth Bring Forth the Living Creature
— Cited (through Plutarch) for saying bedbugs and mice are useful to man
"Chrysippus, as Plutarch attests in Book V On Nature, said that bedbugs and mice are very useful to man"