M. Tullius Cicero Divinatio in Q. Caecilium 4

[4] I was vexed and distressed, O judges, at being brought into such a strait, as to be forced either to let those men's hopes deceive them who had entreated succour and assistance of me, or else, when I had from my very earliest youth devoted myself entirely to defending men, to be now, under the compulsion of the occasion and of my duty, transferred to the part of an accuser. I told them that they had an advocate in Quintus Caecilius, who had been quaestor in the same province after I was quaestor there. But the very thing which I thought would have been an assistance to me in getting rid of this difficulty, was above all things a hindrance to me; for they would have much more easily excused me if they had not known him, or if he had never been among them as quaestor.