“Those who have a scientific outlook on human behaviour, moreover, find it impossible to label any action as ‘sin’; they realise that what we do has its origin in our heredity, our education, and our environment, and that it is by control of these causes, rather than by denunciation, that conduct injurious to society is to be prevented.”

“Moreover, the attitude that one ought to believe such and such a proposition, independently of the question whether there is evidence in its favor, is an attitude which produces hostility to evidence and causes us to close our minds to every fact that does not suit our prejudices.”

“The methods of increasing the degree of truth 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.”

“The only kind of appeal that wins any instinctive response in party politics is an appeal to hostile feeling; the men who perceive the need of cooperation are powerless. Until education has been directed for a generation into new channels, and the Press has abandoned incitements to hatred, only harmful policies have any chance of being adopted in practice by our present political methods. But there is no obvious means of altering education and the Press until our political system is altered. From this dilemma there is no issue by means of ordinary action, at any rate for a long time to come. The best that can be hoped, it seems to me, is that we should, as many of us as possible, become political skeptics, rigidly abstaining from belief in the various attractive party programmes that are put before us from time to time.”

“The universe may have a purpose, but nothing we know suggests that, if so, this purpose has any similarity to ours.”

“Understanding human nature must be the basis of any real improvement in human life. Science has done wonders in mastering the laws of the physical world, but our own nature is much less understood, as yet, than the nature of stars and electrons. When science learns to understand human nature, it will be able to bring a happiness into our lives which machines and the physical sciences have failed to create.”

“We love our habits more than our income, often more than our life.”