In general, if a man says, for instance, that the earth is flat, I am quite willing that he should propagate his opinion as hard as he likes. In practice you will, I think, do better to assume that the earth is round, although, of course, you may be mistaken. Therefore, I do not think we should go in for complete skepticism, but for a doctrine of degrees of probability. I think that, on the whole, that is the kind of doctrine that the world needs. The world has become very full of new dogmas.
New dogmas are much worse that old ones.