“Once knowing is no longer understood as the search for an iconic representation of ontological reality but, instead, as a search for fitting ways of behaving and thinking, the traditional problem disappears. Knowledge can now be seen as something which the organism builds up in the attempt to order the as such amorphous flow of experience by establishing repeatable experiences and relatively reliable relations between them. The possibilities of constructing such an order are determined and perpetually constrained by the preceding steps in the construction. That means that the “real” world manifests itself exclusively there where our constructions break down. But since we can describe and explain these breakdowns only in the very concepts that we have used to build the failing structures, this process can never yield a picture of a world that we could hold responsible for their failure.”

John McCarthy and Patrick J. Hayes. " Some Philosophical Problems from the Standpoint of Artificial Intelligence http://www-formal.stanford.edu/jmc/mcchay69.html", Sect. 2.1, Machine Intelligence 4, ed. Donald Michie (Elsevier, 1969), p. 463 ff., ISBN 0444197443
1960s

Source: The Aquarian Conspiracy (1980), Chapter Eleven, Spiritual Adventure: Connection to the Source, p. 362

Source: Art As a Social System (2000), p. 146 as cited in: Astonishment And Recognition http://unrealnature.wordpress.com/2012/01/26/astonishment-and-recognition/ on unrealnature.wordpress.com, January 26, 2012.

Source: The Theory of Communicative Action, 1987, p. 308

"A Third Kind of Knowledge" http://www.edge.org/q2010/q10_7.html#saffo, in The Edge Annual Question—2010: How Is the Internet Changing the Way You Think? http://www.edge.org/q2010/q10_index.html, January 2010

Creative spirit becomes concrete.
Quote on 'Concrete art', in: 'Comments on the basic of concrete painting', Paris, January 1930; 'Art Concret', April 1930, pp. 2–4
1926 – 1931

Knowing Yourself: The True in the False (1996)
Context: You think: you become that thought. And consciousness, or the state of pure awareness, is lost. The highest knowledge man can possess is that which is true in his own experience. If his experience is limited, so is his knowledge and he behaves accordingly.

Georg Wilhelm Friedrich Hegel, Lectures on the Philosophy of History Vol 2 1837 translated by ES Haldane and Francis H. Simson first translated 1894 p. 386-387
Lectures on the Philosophy of History (1832), Volume 2
Context: That condition which man terms the life of man in unity with nature, and in which man meets with God in nature because he finds his satisfaction there, has ceased to exist. The unity of man with the world is for this end broken, that it may be restored in a higher unity, that the world, as an intelligible world, may be received into God. The relation of man to God thereby reveals itself in the way provided for our salvation in worship, but more particularly it likewise shows itself in Philosophy; and that with the express consciousness of the aim that the individual should render himself capable of belonging to this intelligible world. The manner in which man represents to himself his relation to God is more particularly determined by the manner in which man represents to himself God. What is now often said, that man need not know God, and may yet have the knowledge of this relation, is false. Since God is the First, He determines the relation, and therefore in order to know what is the truth of the relation, man must know God. Since therefore thought goes so far as to deny the natural, what we are now concerned with is not to seek truth in any existing mode, but from our inner Being to go forth again to a true objective, which derives its determination from the intrinsic nature of thought.

Language, that is to say, makes progress possible. </SPAN>
Source: Language in Thought and Action (1949), The Pooling of Knowledge, p. 12