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 in our beliefs are well known; they consist in hearing all sides, trying to ascertain all the relevant facts, controlling our own bias by discussion with people who have the opposite bias, and cultivating a readiness to discard any hypothesis which has proved inadequate. These methods are practised in science, and have built up the body of scientific knowledge. Every man of science whose outlook is truly scientific is ready to admit that what passes for scientific knowledge at the moment is sure to require correction with the progress of discovery; nevertheless, it is near enough to the truth to serve for most practical purposes, though not for all. In science, where alone something approximating to genuine knowledge is to be found, men's attitude is tentative and full of doubt.

In religion and politics, on the contrary, though there is as yet nothing approaching scientific knowledge, everybody considers it de rigueur to have a dogmatic opinion, to be backed up by inflicting starvation, prison, and war, and to be carefully guarded from argumentative competition with any different opinion. If only men could be brought into