[Shevek] came at last to the long array of doors through which crowds of people came and went constantly, all purposeful, all separate. They all looked, to him, anxious. He had often seen that anxiety before in the faces of Urrasti, and wondered about it. Was it because, no matter how much money they had, they always had to worry about making more, lest they die poor? Was it guilt, because no matter how little money they had, there was always somebody who had less? Whatever the cause, it gave all the faces a certain sameness, and he felt very much alone among them.

Chapter 7 (p. 207) - Hainish Cycle - The Dispossessed (1974)