σοὶ μὲν παιδιὰν τοῦτ' εἶναι, ἐμοὶ δὲ θάνατον → This is sport to you but death to me (Aristotle, Eudemian Ethics 1243a20)
produktiv, ex se fertilis (z.B. ingenium). – pr. Geisteskraft, ingenii vis; auch bl. ingenium.