“Gaia's main problems are not industrialization, ozone depletion, overpopulation, or resource depletion. Gaia's main problem is the lack of mutual understanding and mutual agreement in the noosphere about how to proceed with those problems.”

Source: Books, The End of Racism (1995), Ch. 1

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Lecture at Princeton University, Princeton, New Jersey (March 1954); published in “The Unifying Factor” in Realities of American Foreign Policy (1954), p. 116
Context: Now this problem of the adjustment of man to his natural resources, and the problem of how such things as industrialization and urbanization can be accepted without destroying the traditional values of a civilization and corrupting the inner vitality of its life — these things are not only the problems of America; they are the problems of men everywhere. To the extent that we Americans become able to show that we are aware of these problems, and that we are approaching them with coherent and effective ideas of our own which we have the courage to put into effect in our own lives, to that extent a new dimension will come into our relations with the peoples beyond our borders, to that extent, in fact, the dreams of these earlier generations of Americans who saw us as leaders and helpers to the peoples of the world at large will begin to take on flesh and reality.

Source: The Ultimate Foundation of Economic Science (1962), Chapter 5: On Some Popular Errors Concerning the Scope and Method of Economics, § 10 : The Concept of a Perfect System of Government
Context: It is a double-edged makeshift to entrust an individual or a group of individuals with the authority to resort to violence. The enticement implied is too tempting for a human being. The men who are to protect the community against violent aggression easily turn into the most dangerous aggressors. They transgress their mandate. They misuse their power for the oppression of those whom they were expected to defend against oppression. The main political problem is how to prevent the police power from becoming tyrannical. This is the meaning of all the struggles for liberty.

Source: On the Pragmatics of Communication, 1998, p. 23

Presidency (1977–1981), Farewell Address (1981)
Context: Acknowledging the physical realities of our planet does not mean a dismal future of endless sacrifice. In fact, acknowledging these realities is the first step in dealing with them. We can meet the resource problems of the world — water, food, minerals, farmlands, forests, overpopulation, pollution — if we tackle them with courage and foresight.

Peace and the Public Mind (1935)

Source: Fuzzy sets and fuzzy logic (1995), p. 2-3.

Source: The architecture of markets, 2001, p. 16