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The desire to understand the world and the desire to reform it are the two great engines of progress, without which human society would stand still or retrogress. It may be that too complete a happiness would cause the impulses to knowledge and reform to fade. ... But I cannot admit that it is any part of the duty of human beings to provide others with pain on the off-chance that it may prove fruitful. ... So long as there is death there will be sorrow, and so long as there is sorrow it can be no part of the duty of human beings to increase its amount, ...
Source: Marriage and Morals, 1929
More info.: https://russell-j.com/beginner/MM20-110.HTM