«No one has the right to destroy another person's belief by demanding empirical evidence.»

«Common-sense is part of the home-made ideology of those who have been deprived of fundamental learning, of those who have been kept ignorant. This ideology is compounded from different sources: items that have survived from religion, items of empirical knowledge, items of protective skepticism, items culled for comfort from the superficial learning that is supplied. But the point is that common-sense can never teach itself, can never advance beyond its own limits, for as soon as the lack of fundamental learning has been made good, all items become questionable and the whole function of common-sense is destroyed. Common-sense can only exist as a category insofar as it can be distinguished from the spirit of inquiry, from philosophy.»

«The grand aim of all science is to cover the greatest number of empirical facts by logical deduction from the smallest number of hypotheses or axioms.»

«It had become clear to me, in a flash of illumination, that for me the only possible goal was psychiatry. Here alone the two currents of my interest could flow together and in a united stream dig their own bed. Here was the empirical field common to biological and spiritual facts, which I had everywhere sought and nowhere found. Here at last was the place where the collision of nature and spirit became a reality.»

«The belief that politics can be scientific must inevitably produce tyrannies. Politics cannot be a science, because in politics theory and practice cannot be separated, and the sciences depend upon their separation. Empirical politics must be kept in bounds by democratic institutions, which leave it up to the subjects of the experiment to say whether it shall be tried, and to stop it if they dislike it, because, in politics, there is a distinction, unknown to science, between Truth and Justice.»