Institutio Oratoria

The means for securing the acquittal of an accused person are strictly limited. His innocence may be established, some superior authority may intervene, force or bribery may be employed, his guilt may be difficult to prove, or there may be collusion between the advocates. You admit that he was guilty; no superior authority intervened, no violence was used and you make no complaint that the jury was bribed, while there was no difficulty about proving his guilt. What conclusion is left to us save that there was collusion?

If I could not dispose of all the points against me, I disposed of the majority.

It is acknowledged that a man was killed: but he was not killed in a solitary place, such as might lead me to suspect that he was the victim of robbers; he was not killed for the sake of plunder, for nothing was taken from him; he was not killed in the hope of inheriting his property, for he was poor: the motive must therefore have been hatred, since you are his enemy.