Quintilian, and J.S. Watson. Institutes of Oratory. Edited by Lee Honeycutt, 2010. Kindle Electronic Edition. Book 10 Chapter 4.
In book 10 chapter four Quintilian discusses corrections to a rhetorician’s writing. In essence, we add material, remove material, or change it (Quintilian X.4.1). The correction is more difficult than adding and removing material. Because the orator often works on a deadline, it is important that he learn to make changes promptly and be finished. Orators often make the mistake of correction for the sake of correction. This may make a work worse (Quintilian X.4.3). It is important to know when to leave well enough alone.