
“Accordingly, the first essential is that those feelings should prevail with us that we wish to prevail with the judge, and that we should be moved ourselves before we attempt to move others.”
Primum est igitur ut apud nos valeant ea quae valere apud iudicem volumus, adficiamurque antequam adficere conemur.
Book VI, Chapter II, 28; translation by H. E. Butler
De Institutione Oratoria (c. 95 AD)