Institutio Oratoria

And even if display is the object of declamation, surely we ought to unbend a little for the entertainment of our audience.

For even in those speeches which, although undoubtedly to some extent concerned with the truth, are designed to charm the multitude (such for instance as panegyrics and the oratory of display in all its branches), it is permissible to be more ornate and not merely to disclose all the resources of our art, which in cases of law should as a rule be concealed, but actually to flaunt them before those who have been summoned to hear us.

Declamation therefore should resemble the truth, since it is modelled on forensic and deliberative oratory. On the other hand it also involves an element of display, and should in consequence assume a certain air of elegance.