In The World Of Human Thought Generally, And In Physical Science Particularly, The Most Important And Fruitful Concepts Are Those To Which It Is Impossible To Attach A Well-defined Meaning.

HomeFortune CookiesMiscellaneous Collections

In the world of human thought generally, and in physical
science particularly, the most important and fruitful concepts
are those to which it is impossible to attach a well-defined
meaning.
-- H.A. Kramers

Related: