“Those who are filled with concern for the lot of humanity as a whole, especially for the less fortunate portions of it, are wont nowadays to call themselves idealists. We should at least recognize that ideals in this sense are not the same as standards and that they are often indeed the opposite of standards. It would be easy to mention institutions of learning in this country that are at present engaged in breaking down standards in the name of ideals.”

Source: Norwegian Wood

Variant: Cynics are - beneath it all - only idealists with awkwardly high standards.
Source: The Course of Love

1980s and later, Interview in Silver & Gold Report (1980)

Dune Genesis (1980)
Context: In the beginning I was just as ready as anyone to fall into step, to seek out the guilty and to punish the sinners, even to become a leader. Nothing, I felt, would give me more gratification than riding the steed of yellow journalism into crusade, doing the book that would right the old wrongs.
Reevaluation raised haunting questions. I now believe that evolution, or deevolution, never ends short of death, that no society has ever achieved an absolute pinnacle, that all humans are not created equal. In fact, I believe attempts to create some abstract equalization create a morass of injustices that rebound on the equalizers. Equal justice and equal opportunity are ideals we should seek, but we should recognize that humans administer the ideals and that humans do not have equal ability.

Day of Affirmation Address (1966)
Context: The second danger is that of expediency: of those who say that hopes and beliefs must bend before immediate necessities. Of course, if we must act effectively we must deal with the world as it is. We must get things done. But if there was one thing that President Kennedy stood for that touched the most profound feeling of young people around the world, it was the belief that idealism, high aspirations, and deep convictions are not incompatible with the most practical and efficient of programs — that there is no basic inconsistency between ideals and realistic possibilities, no separation between the deepest desires of heart and of mind and the rational application of human effort to human problems. It is not realistic or hardheaded to solve problems and take action unguided by ultimate moral aims and values, although we all know some who claim that it is so. In my judgment, it is thoughtless folly. For it ignores the realities of human faith and of passion and of belief — forces ultimately more powerful than all of the calculations of our economists or of our generals. Of course to adhere to standards, to idealism, to vision in the face of immediate dangers takes great courage and takes self-confidence. But we also know that only those who dare to fail greatly, can ever achieve greatly.

Source: Value and capital, (1939), p. 184 as cited in: Asheim, Geir B. "Economic analysis of sustainability." Justifying, Characterizing and Indicating Sustainability (2007): 1-15.

What Am I Doing in New Jersey? (1988)

Source: A Theory of Justice (1971; 1975; 1999), Chapter II, Section 10, pg. 58