“The pages are so harmonious in their proportion / disharmony in the contents is impossible.”

Power Of The Plus Factor (1987)

this harmonic proportion may be expressed as <math>\frac{12}{6}=\frac{12-8}{8-6}</math> or inversely.
Nicomachus of Gerasa: Introduction to Arithmetic (1926)

Source: The Grand Chessboard (1997), Chapter 1, Hegemony Of A New Type, p. 25.

Introduction<!-- p. 5 -->
Space—Time—Matter (1952)
Context: It is the nature of a real thing to be inexhaustible in content; we can get an ever deeper insight into this content by the continual addition of new experiences, partly in apparent contradiction, by bringing them into harmony with one another. In this interpretation, things of the real world are approximate ideas. From this arises the empirical character of all our knowledge of reality.

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 47.

As quoted by Tanner, Bower, McLeish, and Gaspar in Ch. 1. "Unity and Symmetry in the De Luce of Robert Grosseteste," Robert Grosseteste and the pursuit of Religious and Scientific Learning in the Middle Ages (2016) ed., Jack P. Cunningham, Mark Hocknull, p. 17.
De artibus liberalibus (c. 1222-1237)