Source: No Enemy But Time (1982), Chapter 18 “In a Season of Drought” (p. 158)
Quotes from book
No Enemy But Time

No Enemy But Time is a 1982 science fiction novel by Michael Bishop. It won the 1982 Nebula Award for Best Novel, and was also nominated for the 1983 John W. Campbell Memorial Award. It was included in David Pringle's book Science Fiction: The 100 Best Novels.
“Necessary is often the mother of light fingers instead of invention.”
Source: No Enemy But Time (1982), Chapter 10 “Fruit of the Looms” (p. 76)
Source: No Enemy But Time (1982), Chapter 30 “Marakoi, Zarakal” (p. 315; closing words)
“They had both changed in eight years, eroded or subtly augmented by the sweep of time’s river.”
Source: No Enemy But Time (1982), Chapter 30 “Marakoi, Zarakal” (p. 303)
“Paleoanthropologists were congenitally media-oriented.”
Source: No Enemy But Time (1982), Chapter 17 “Pensacola, Florida” (p. 147)
“You can’t go home again, particularly if you never had one.”
Source: No Enemy But Time (1982), Chapter 23 “Panama City, Florida” (p. 206)