Quintilian, Institutio Oratoria, Book 11
Harold Edgeworth Butler, Ed.

[93] These two statements may seem to be inconsistent, but as a matter of fact both alike deserve the praise which they receive. The difference is due to the fact that cases differ in character. Those of minor importance are admirably suited by the simplicity and negligence of unaffected language, whereas cases of greater moment are best suited by the grand style. Cicero is pre-eminent in both. Now while eminence in one of these styles may seem to the inexperienced to be within their grasp, those who understand know that they are capable of eminence in neither.

II. Some regard memory as being no more than one of nature's gifts; and this view is no doubt true to a great extent; but, like everything else, memory [p. 213] may be improved by cultivation. And all the labour of which I have so far spoken will be in vain unless all the other departments be co-ordinated by the animating principle of memory. For our whole education depends upon memory, and we shall receive instruction all in vain if all we hear slips from us, while it is the power of memory alone that brings before us all the store of precedents, laws, rulings, sayings and facts which the orator must possess in abundance and which he must always hold ready for immediate use. Indeed it is not without good reason that memory has been called the treasure-house of eloquence.