οἱ τοῖς πέλας ἐπιβουλεύοντες, λανθάνουσι πολλὰκις ὑφ' ἑτέρων τοῦτ' αὐτὸ πάσχοντες → when people plot against their neighbours, they fall victim to the same sort of plot themselves
dūrĭtūdo: ĭnis, f. durus, II. B.,
I harshness, cruelty, Cato ap. Gell. 17, 2, 20; id. ap. Non. 100, 23.
dūrĭtūdō,¹⁶ ĭnis, f. (durus), impudence : Cat. d. Gell. 17, 2, 20.