Source: "Foundations of the Theory of Signs," 1938, p. 58-59 as cited in: Adam Schaff (1962). Introduction to semantics, p. 88-89
“The characteristic activity of science is not construction, but induction. The more often something has occurred in the past, the more certain that it will in all the future. Knowledge relates solely to what is and to its recurrence. New forms of being, especially those arising from the historical activity of man, lie beyond empiricist theory. Thoughts which are not simply carried over from the prevailing pattern of consciousness, but arise from the aims and resolves of the individual, in short, all historical tendencies that reach beyond what is present and recurrent, do not belong to the domain of science.”
Source: "The Latest Attack on Metaphysics" (1937), p. 144.
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Max Horkheimer 61
German philosopher and sociologist 1895–1973Related quotes

Source: Nationalism and Culture (1937), Ch. 1 "The Insufficiency of Economic Materialism"
Context: Every process which arises from our physical being and is related to it, is an event which lies outside of our volition. Every social process, however, arises from human intentions and human goal setting and occurs within the limits of our volition. Consequently, it is not subject to the concept of natural necessity. … We are here stating no prejudiced opinion, but merely an established fact. Every result of human purposiveness is of indisputable importance for man's social existence, but we should stop regarding social processes as deterministic manifestations of a necessary course of events. Such a view can only lead to the most erroneous conclusions and contribute to a fatal confusion in our understanding of historical events.
It is doubtless the task of the historian to trace the inner connection of historical events and to make clear their causes and effects, but he must not forget that these connections are of a sort quite different from those of natural physical events and must therefore have quite a different valuation.

Source: The Urban Question: A Marxist Approach, 1977, p. 124 as quoted in: Phil Hubbard, Rob Kitchin (2010) Key Thinkers on Space and Place. p. 101

The Writings of Marguerite Bourgeoys, p. 169

Intuitive Thinking as a Spiritual Path. A Philosophy of Freedom (GA 4), Hudson (1894)/1995.

Source: The Principles of Science: A Treatise on Logic and Scientific Method (1874) Vol. 1, p. 14

"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)

In the definition of the heart is placed as a corollary that the direct Sadhana for knowing the heart is the tracking down to the origin of the I-thought.
The Science of the Heart
"False Premise, Good Science", p. 138
The Flamingo's Smile (1985)

As quoted by Morris Kline, Mathematics and the Physical World (1959) Ch. 25: From Calculus to Cosmic Planning, pp. 441–42.