“At this point in history when all things which concern man and the structure and elements of history itself are suddenly revealed to us in a new light, it behooves us in our scientific thinking to become masters of the situation, for it is not inconceivable that sooner than we suspect, as has often been the case before in history, this vision may disappear, the opportunity may be lost, and the world will once again present a static, uniform, and inflexible countenance.”
Ideology and Utopia (1929)
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Karl Mannheim 28
Hungarian sociologist 1893–1947Related quotes

"Nationalism in the West", 1917. Reprinted in Rabindranath Tagore and Mohit K. Ray, Essays (2007, p. 492).

Preface
A Book of Travel to Three Continents (Translated from Dahri) (1914)

quotations for him
Source: “Zeitschrift für Geopolitik”, Februar 1936

2008, A World that Stands as One (July 2008)
Context: People of Berlin — and people of the world — the scale of our challenge is great. The road ahead will be long. But I come before you to say that we are heirs to a struggle for freedom. We are a people of improbable hope. With an eye toward the future, with resolve in our hearts, let us remember this history, and answer our destiny, and remake the world once again.

"The War Speeches of William Pitt", Oxford University Press, 1915, p. 16
Speech in the House of Commons, 17 February 1792, introducing the Budget. His prediction was a vain hope.