οὐ γὰρ ἂν τό γε πραχθὲν ἀγένητον θείη → since he cannot make what was done as though it had not come to pass
per-mātūresco: rŭi, 3,I v. inch. n., to become quite ripe, to ripen fully: ubi pomum permaturuit, Ov. M. 4, 165; Cels. 2, 24.