“Even in the world of molecules the civilising influence of modest restraints is a cause for rejoicing.”

Source: https://en.wikisource.org/wiki/Ante-Nicene_Fathers/Volume_III/Apologetic/On_Idolatry/Of_the_Observance_of_Days_Connected_with_Idolatry Chapter 13, On Idolatry

Principles of Modern Chemistry (7th ed., 2012), Ch. 3 : Classical Bonding: The Classical Description

Source: The Dragons of Eden (1977), Chapter 2, “Genes and Brains” (p. 27)

Source: The Second Sin (1973), p. 102.

Farewell letter to Fidel Castro (1965)

Source: Excerpts of letter to his first wife (14 July 1975)

Lecture II : The Universal Categories, §3. Laws: Nominalism, CP 5.65
Pragmatism and Pragmaticism (1903)
Context: All nature abounds in proofs of other influences than merely mechanical action, even in the physical world. They crowd in upon us at the rate of several every minute. And my observation of men has led me to this little generalization. Speaking only of men who really think for themselves and not of mere reporters, I have not found that it is the men whose lives are mostly passed within the four walls of a physical laboratory who are most inclined to be satisfied with a purely mechanical metaphysics. On the contrary, the more clearly they understand how physical forces work the more incredible it seems to them that such action should explain what happens out of doors. A larger proportion of materialists and agnostics is to be found among the thinking physiologists and other naturalists, and the largest proportion of all among those who derive their ideas of physical science from reading popular books.

Source: Gregor and the Code of Claw

as quoted in [Dave DeMille, Diatomic molecules, a window onto fundamental physics, Physics Today, 2015, December, 34, 68, 12, 10.1063/PT.3.3020]