"Heidegger's method, and especially the philosophical earnestness fundamental to its application, achieved for the philosophical public of Germany a new Copernican revolution of speculative thought. It one takes that judgment seriously, one should expect, therefore, that a more considered study might reveal, within the framework of an anthropocentric approach to metaphysics, some unique insight or some new tools of analysis. As a matter of fact, I cannot make any such discovery either in Heidegger's published works or in oral exposition of his views. A close examination seems rather to expose, within the ponderous sentences of essay lecture, a very insubstantial basis for a flimsy superstructure. Heidegger's philosophy is unique only rampant misuse of language and in its own emphatic claim to uniqueness."
January 1, 1970
https://en.wikiquote.org/wiki/Martin_Heidegger