“The sole remaining task for philosophy is the analysis of language.”
Though this has been quoted extensively as if it were a statement of Wittgenstein, it was apparently first published in A Brief History of Time (1988) by Stephen Hawking, p. 175, where it is presented in quotation marks and thus easily interpreted to be a quotation, but could conceivably be Hawking paraphrasing or giving his own particular summation of Wittgenstein's ideas, as there seem to be no published sources of such a statement prior to this one. The full remark by Hawking reads:
: Philosophers reduced the scope of their inquiries so much that Wittgenstein, the most famous philosopher of this century, said, “The sole remaining task for philosophy is the analysis of language.” What a comedown from the great tradition of philosophy from Aristotle to Kant!
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Ludwig Wittgenstein 228
Austrian-British philosopher 1889–1951Related quotes

Quoted in Library of Living Philosophers: The Philosophy of Bertrand Russell (1944)
1940s

Fundamenta Krestomatio http://www.gutenberg.org/etext/8224, by Ludwik Lejzer Zamenhof, first published in 1903

“Philosophy seemed to me the supreme, even the sole, concern of man.”
On My Philosopy (1941)
Context: My path was not the normal one of professors of philosophy. I did not intend to become a doctor of philosophy by studying philosophy (I am in fact a doctor of medicine) nor did I by any means, intend originally to qualify for a professorship by a dissertation on philosophy. To decide to become a philosopher seemed as foolish to me as to decide to become a poet. Since my schooldays, however, I was guided by philosophical questions. Philosophy seemed to me the supreme, even the sole, concern of man. Yet a certain awe kept me from making it my profession.

“To comprehend what is, is the task of philosophy: and what is is Reason.”
Works, VII, 17.
Context: The great thing however is, in the show of the temporal and the transient to recognize the substance which is immanent and the eternal which is present. For the work of Reason (which is synonymous with the Idea) when considered in its own actuality, is to simultaneously enter external existence and emerge with an infinite wealth of forms, phenomena and phases — a multiplicity that envelops its essential rational kernel with a motley outer rind with which our ordinary consciousness is earliest at home. It is this rind that the Concept must penetrate before Reason can find its own inward pulse and feel it still beating even in the outward phases. But this infinite variety of circumstances which is formed in this element of externality by the light of the rational essence shining in it — all this infinite material, with its regulatory laws — is not the object of philosophy.... To comprehend what is, is the task of philosophy: and what is is Reason.

“The task of philosophy is to recover the totality obscured by the selection.”
Pt. I, ch. 1, sec. 6.
1920s, Process and Reality: An Essay in Cosmology (1929)
Context: Philosophy is the self-correction by consciousness of its own initial excess of subjectivity. Each actual occasion contributes to the circumstances of its origin additional formative elements deepening its own peculiar individuality. Consciousness is only the last and greatest of such elements by which the selective character of the individual obscures the external totality from which it originates and which it embodies. An actual individual, of such higher grade, has truck with the totality of things by reason of its sheer actuality; but it has attained its individual depth of being by a selective emphasis limited to its own purposes. The task of philosophy is to recover the totality obscured by the selection.

Source: Essays in the Philosophy of Language, 1967, p. 20-21

"American Indian Grammatical Categories", edited by Morris Swadesh in Word, 2 (1946)
Context: It would be naïve to imagine that any analysis of experience is dependent on pattern expressed in language. Any concept, whether or not it forms part of the system of grammatical categories, can be conveyed in any language. If a notion is lacking in a given series, it implies a different configuration and not a lack of expressive power.