“To say that the activity of science and art helps humanity's progress, if by that activity we mean the activity which now calls itself by those names, is as though one said that the clumsy, obstructive splashing of oars in a boat moving down stream assists the boat's progress. It only hinders it… The proof of this is seen in the confession made by men of science that the achievements of the arts and sciences are inaccessible to the labouring masses on account of the unequal distribution of wealth.”

What then must we do? (1886)

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 2: The Place of Science in a Liberal Education

100 Years of Mathematics: a Personal Viewpoint (1981)

Part 3: "The Sense of Human Dignity", §6 (p. 63–64)
Science and Human Values (1956, 1965)
Context: Tolerance among scientists cannot be based on indifference, it must be based on respect. Respect as a personal value implies, in any society, the public acknowledgements of justice and of due honor. These are values which to the layman seem most remote from any abstract study. Justice, honor, the respect of man for man: What, he asks, have these human values to do with science? [... ]
Those who think that science is ethically neutral confuse the findings of science, which are, with the activity of science, which is not.

Race: A Study in Modern Superstition (1937)
Context: In seventeenth- and eighteenth-century France, race was already a weapon in the struggle between absolutism, aristocracy, and the middle class. The warfare spread to the arts and philosophy in the nineteenth century, by which time independent shoots in other cultures had also borne fruit, leaving the grand harvesting on a world-wide scale to our generation.
Viewed in the light of such facts, the race question appears a much bigger affair than a trumped-up excuse for local persecution. It becomes rather a mode of thought endemic in Western civilization. It defaces every type of mental activity — history, art, politics, science and social reform.

Source: Next

Source: Gooyanews website, 2015 http://news.gooya.com/politics/archives/2016/03/209463.php

Source: Conjectures and Refutations: The Growth of Scientific Knowledge (1963), Ch. 1 "Science : Conjectures and Refutations"
Context: The history of science, like the history of all human ideas, is a history of irresponsible dreams, of obstinacy, and of error. But science is one of the very few human activities — perhaps the only one — in which errors are systematically criticized and fairly often, in time, corrected. This is why we can say that, in science, we often learn from our mistakes, and why we can speak clearly and sensibly about making progress there.

Introduction à l'Étude de la Médecine Expérimentale (1865)