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... infamiam veram effugere non poterat. Sed qui prima illa...

In this age, unless someone should have defended himself by means of his own seriousness, and his chastity, and not only thorough his domestic discipline but also through some good thing of his own, in whatever way he had been defended by his kin, then he would not have been able to escape true infamy. (double negative- nisi non. unless he did this, he would not be able to do this) Cicero is generalizing.