E.T. Gendlin, University of Chicago, at The Philosophical Forum
"Wittgenstein insisted that rules cannot govern speech, because they are formulated only from the practice of speaking, and only by it. He also rejected observational reports as a basis for understanding language. It has long been an open question, just where Wittgenstein is speaking from."
See Wittgenstein, Philosophical Investigations, in Great Books of the Western World (second edition, 60 Vol., 1990) volume 55.