"The rise and fall of images of the future precedes or accompanies the rise and fall of cultures. As long as a society's image is positive and flourishing, the flower of culture is in full bloom. Once the image begins to decay and lose its vitality, however, the culture does not long survive."

“: Thought models, or models of the future, are useful insofar as they can reasonably contribute towards the optimum realization of man’s future-directed wishes and actions in a given situation or period;”

“As the reader is aware, at the cradle of our learning stood the philosophy of Asia Minor and Greece, itself influenced in turn by Indian and Oriental philosophical and religious conceptions. It is the tragedy of this philosophy that, although it was traditionally directed towards the undogmatic acquisition of wisdom and virtue, always regarding the freedom of human rational thought in visionary fashion as the highest good, it nevertheless inevitably led to a mental hardening of the arteries into coercive thought models.”

“Optimum realization aims at a harmonious synthesis of effectiveness and justice in the furthest possible surveyable part of future time;”

“: For this purpose everyone, choosing in complete freedom and on his own responsibility, must be able and permitted to utilize all the philosophical and scientific thought models useful for this vital choice;”

“The trends in modem technology reveal most clearly the contrasting modes of development in thinking about the future. Technology offers an unprecedented confirmation of the possibilities of the utopia, often far exceeding the utopian fantasies in its concrete achievements. Through technology, Homo sapiens can transform ail things; at last man appears to be master of his own fate.”

“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.”