M. Tullius Cicero Pro P. Sulla 35

[35] Do you not see now, how I deliver you from the danger of any sudden popularity among the wicked, and reconcile you to all good men? who love you, and cherish you, and who always will cherish you; nor, if perchance you for a while abandon me, will they on that account allow you to abandon them and the republic and your own dignity.
  But now I return to the cause; and I call you, O judges, to hear witness to this;—that this necessity of speaking of myself was imposed on me by him. For if Torquatus had been content with accusing Sulla, I too at the present time should have done nothing beyond defending him who had been accused; but when he, in his whole speech, inveighed against me, and when, in the very beginning, as I said, he sought to deprive my defence of all authority, even if my indignation had not compelled me to speak, still the necessity of doing justice to my cause would have demanded this speech from me.