Writing Well Quotes

William Zinsser (2012). “On Writing Well, 30th Anniversary Edition: An Informal Guide to Writing Nonfiction”, p.5, Harper Collins
"On Writing Well". Book by William Zinsser (Chapter 8: Unity, p. 49), 1976.
Quintilian (1856). “Quintilian's Institutes of Oratory, Or, Education of an Orator: In Twelve Books”, p.286