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2714. χρή (χρῆν, ἐχρῆν) takes either μή or οὐ.

““χρὴ μὴ καταφρονεῖν τοῦ πλήθουςone must not despise the multitudeI. 5.79, ““χρῆν οὔ σ᾽ ἁμαρτάνεινthou oughtst not to do wrongE. Hipp. 507, χρῆ δ᾽ οὔποτ᾽ ““εἰπεῖν οὐδέν᾽ ὄλβιον βροτῶνit is not right ever to call any son of man happyE. And. 100.

a. For original οὐ χρή was substituted (for emphasis) χρὴ οὐ, where the οὐ was still taken with χρή; ultimately οὐ was felt to belong with the infinitive and hence came to be separated from χρή.

b. δεῖ takes μή, as ““μὴ ὀκνεῖν δεῖ αὐτούςthey must not fearT. 1.120. οὐ δεῖ may be used for δεῖ μή (2693). In ““δεῖ οὐχ ἁπλῶς εἰπεῖνone must not speak in a general wayI. 15.117 οὐχ is adherescent. Note οἶμαι δεῖν οὐ, φημὶ χρῆναι οὐ, οἶμαι χρῆναι μή.

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