Institutio Oratoria

I think I need hardly insist on the necessity for the avoidance in debate of mere violence and noise and such forms of pleasantry as are dear to tile uneducated. For unscrupulous violence, although annoying to one's antagonist, makes an unpleasant impression on the judge. It is also bad policy to light hard for points which you cannot prove.

For where defeat is inevitable, it is wisest to yield, since, if there are a number of other points in dispute, we shall find it easier to prove what remains, while if there is only one point at issue, surrender with a good grace will generally secure some mitigation of punishment. For obstinacy in the defence of a fault, more especially after detection, is simply the commission of a fresh fault.