Every great thinker who has concerned himself with the historical process has speculated about the meaning of time and its flow in history. Marx, Hegel, Spengler, Toynbee, and Sorokin, each with his own variation on the theme of time-flow as mechanically patterned fluctuation, predict the future but ignore its dynamic interaction with the past and the present.

p. 1 (partly cited in: European Centre for Leisure and Education (1975) Society and leisure. Vol. 7. p. 22) - The Image of the Future, 1973