“What raises us out of nature is the only thing whose nature we can know: language. Through its structure, autonomy and responsibility are posited for us. Our first sentence expressed unequivocally the intention of universal and unconstrained consensus. Taken together, autonomy and responsibility constitute the only idea we posses a priori in the sense of the philosophical tradition.”
"Knowledge and Human Interests, p. 314"

Contrast the above with a recent formulation:

". . . weak naturalism contents itself with the basic background assumption that the biological ednowment and the cultural way of life of Homo sapiens have a "natural" origin and can in principle be explained in terms of evolutionary theory."

"Truth and Justification, pp. 27-28"