The pretext for progressive rhetoric is, of course, the idea that man, the creature of reason and benevolence, has only to understand the truth in order to act upon it. But the function of progressive rhetoric is another matter; it is, in Dwight McDonald's phrase, to accomplish "in fantasy what cannot be accomplished in reality." Because politics is for [the liberal] a means of accommodating himself to a world he does not like but does not really want to change, he can find ample gratification in words. They appease his twinges of guilt without committing him to very drastic action. Thus the expiatory role of resolutions in progressive meetings.

Arthur Schlesinger, The Vital Center (1949)