Institutio Oratoria

There are further reasons why we should sometimes dispense with partition. In the first place there are many points which can be produced in a more attractive manner, if they appear to be discovered on the spot and not to have been brought ready made from our study, but rather to have sprung from the requirements of the case itself while we were speaking. Thus we get those not unpleasing figures such as

It has almost escaped me,

I had forgotten,

or

You do well to remind me.

For if we set forth all that we propose to prove in advance, we shall deprive ourselves of the advantage springing from tile charm of novelty.