11. μήτι ἡ πηγὴ κ.τ.λ. An argument from natural analogy. This inconsistency of blessing and cursing with the same mouth is unnatural. We are reminded of Aristotle’s argument against usury—the unnaturalness of ‘barren metal’ bearing, having offspring (τόκος) as it were.
ἡ πηγή, the article generalises. Comp. Od. IV. 406 πικρὸν ἀποπνείουσαι ἁλὸς πολυβενθέος ὀδμήν: Herod. IV. 52 ἐκδιδοῖ γὰρ ἐς αὐτὸν κρήνη πικρή: Geor. II. 238 “salsa etiam tellus et quae perhibetur amara.”