“Introspectionism got its ism because the protesting new schools needed a clear and stable contrasting background against which to exhibit their novel features. No proponent of introspection a the basic method of psychology ever called himself an introspectionist.”

Source: "The history of introspection reconsidered." 1980, p. 241

The Naked Communist (1958)

Source: Meaning And Necessity (1947), p. v: Preface

The Architecture of Theories (1891)
Context: The law of habit exhibits a striking contrast to all physical laws in the character of its commands. A physical law is absolute. What it requires is an exact relation. Thus, a physical force introduces into a motion a component motion to be combined with the rest by the parallelogram of forces; but the component motion must actually take place exactly as required by the law of force. On the other hand, no exact conformity is required by the mental law. Nay, exact conformity would be in downright conflict with the law; since it would instantly crystallise thought and prevent all further formation of habit. The law of mind only makes a given feeling more likely to arise. It thus resembles the "non-conservative" forces of physics, such as viscosity and the like, which are due to statistical uniformities in the chance encounters of trillions of molecules.

Benway
Naked Lunch (1959)

I use the word in the old sense: ...something which is apart from general opinion, either in subject-matter, method, or conclusion. ...Thus in the sixteenth century many spoke of the earth's motion as the paradox of Copernicus, who held the ingenuity of that theory in very high esteem, and some, I think, who even inclined towards it. In the seventeenth century, the depravation of meaning took place... Phillips says paradox is "a thing which seemeth strange"—here is the old meaning...—"and absurd, and is contrary to common opinion," which is an addition due to his own time.
A Budget of Paradoxes (1872)

Source: The Managerial Revolution, 1941, p. 201–202.

Hansard http://www.publications.parliament.uk/pa/cm200304/cmhansrd/vo031203/debtext/31203-03.htm#31203-03_wqn4, House of Commons, 6th series, vol. 415 col. 498
At Prime Minister's Question Time in the House of Commons, December 3, 2003