Res Gestae

On this he took a firm stand, to the end that, as this freedom increased their dissension, he might afterwards have no fear of a united populace, knowing as he did from experience that no wild beasts are such enemies to mankind as are most of the Christians in their deadly hatred of one another. And he often used to say:

Hear me, to whom the Alamanni and the Franks have given ear, thinking that in this he was imitating a saying of the earlier emperor Marcus. But he did not observe that the two cases were very different.