Institutio Oratoria

The nature of these three styles is, broadly speaking, as follows. The first would seem best adapted for instructing, the second for moving, and the third (by whichever name we call it) for charming or, as others would have it, conciliating the audience; for instruction the quality most

needed is acumen, for conciliation gentleness, and for stirring the emotions force. Consequently it is mainly in the plain style that we shall state our facts and advance our proofs, though it should be borne in mind that this style will often be sufficiently full in itself without any assistance whatever from the other two.