If the concept of probability and the formulae of the theory of probability are used without a clear understanding of the collectives involved, one m… - Richard von Mises

Mass phenomena to which the theory of probability does not apply are, of course, of common occurrence.

I am prepared to concede without further argument that all the theoretical constructions, including geometry, which are used in the various branches of physics are only imperfect instruments to enable the world of empirical fact to be reconstructed in our minds.

I do not want to defend the occult sciences; I am, however, convinced that further unbiased investigation of these phenomena by collection and evaluation of old and new evidence, in the usual scientific manner, will lead us sooner or later to the discovery of new and important relations of which we have as yet no knowledge, but which are natural phenomena in the usual sense.