I will speak in a low voice, just so as to let the judges hear me. For men are not wanting who would be glad to excite that people against me and against every eminent man; and I will not assist them and enable them to do so more easily.
Sic submissa voce agam tantum ut iudices audiant; neque enim desunt qui istos in me atque in optimum quemque incitent; quos ego, quo id facilius faciant, non adiuvabo.
Original text (Latin)
Notes from Wikiquote
Cicero, The Orations of Marcus Tullius Cicero; Translation by C.D. Yonge., 1856.