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Without a revolutionary theory there can be no revolutionary movement. This cannot be insisted upon too strongly at a time when the fashionable preaching of opportunism is combined with absorption in the narrowest forms of practical activity.
Vladimir Lenin
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Before the 1940s the terms "system" and "systems thinking" had been used by several scientists, but it was Bertalanffy's concepts of an open system and a general systems theory that established systems thinking as a major scientific movement.
Fritjof Capra
Philosophy's position with regard to science, which at one time could be designated with the name "theory of knowledge," has been undermined by the movement of philosophical thought itself. Philosophy was dislodged from this position by philosophy.
Jürgen Habermas
I am inclined to say that the personal attendance and intervention of women in election proceedings, even apart from any suspicion of the wider objects of many of the promoters of the present movement, would be a practical evil not only of the gravest, but even of an intolerable character.
William Ewart Gladstone
I came at age in the '60s, and initially my hopes and dreams were invested in politics and the movements of the time - the anti-war movement, the civil rights movement. I worked on Bobby Kennedy's campaign for president as a teenager in California and the night he was killed.
David Talbot
One important idea is that science is a means whereby learning is achieved, not by mere theoretical speculation on the one hand, nor by the undirected accumulation of practical facts on the other, but rather by a motivated iteration between theory and practice.
George E. P. Box