Quintilian, Institutio Oratoria, Book 7
Harold Edgeworth Butler, Ed.

[17] This end will be attained if we note what best suits each position, and take care that the words which we place together are such as will not clash, but will mutually harmonise. Thus different facts will not seem like perfect strangers thrust into uncongenial company from distant places, but will be united with what precedes and follows by an intimate bond of union, with the result that our [p. 173] speech will give the impression not merely of having been put together, but of natural continuity. I fear, however, that I have been lured on from one thing to another and have advanced somewhat too far, since I find myself gliding from the subject of arrangement to the discussion of the general rules of style, which will form the opening theme of the next book.