Introduction
Higher Mathematics for Chemical Students (1911)
“Humanity cannot progress by importing into theoretical study the processes of blind routine and haphazard experiment by which production has so long been dominated. … The true relation between theory and application only appears when theoretical research has been purged of all empiricism.”
“The teaching of mathematics,” p. 71-72
On Science, Necessity, and the Love of God (1968)
Context: My purpose here is to denounce an idea which seems to be dangerous and false. … Revolutionary trade unionists and orthodox communists are at one in considering everything that is purely theoretical as bourgeois. … The culture of a socialist society would be a synthesis of theory and practice; but to synthesize is not the same as to confuse together; it is only contraries that can be synthesized. … Marx’s principal glory is to have rescued the study of societies not only from Utopianism but also and at the same time from empiricism. … Humanity cannot progress by importing into theoretical study the processes of blind routine and haphazard experiment by which production has so long been dominated. … The true relation between theory and application only appears when theoretical research has been purged of all empiricism.
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Simone Weil 193
French philosopher, Christian mystic, and social activist 1909–1943Related quotes

Michael Halliday (1985, p. xxiii) cited in: David Brazil (1995) A Grammar of Speech. p. 10.
1970s and later

Second Lecture, The Elements of the Theory of Probability, p. 32
Probability, Statistics And Truth - Second Revised English Edition - (1957)
Article abstract
"Applications of structural equation modeling in marketing and consumer research", 1996
in Impact of Advances in science and new technologies on society http://www.here-now4u.de/eng/impact_of_advances_in_science_.htm, 1998.

Source: Power Kills: Democracy as a Method of Nonviolence(1997), p. 114

From Gibbs's letter accepting the Rumford Medal (1881). Quoted in A. L. Mackay, Dictionary of Scientific Quotations (London, 1994).

As quoted in The Life and Science of Léon Foucault : The Man Who Proved the Earth Rotates (2003) by William Tobin, p. 93.

Source: The structure of social action (1937), p. 8