“Philosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity.”
Variant translation: Philosophy is not a theory but an activity. A philosophical work consists essentially of elucidations. The result of philosophy is not a number of "philosophical propositions." but to make propositions clear.
Original German: Der Zweck der Philosophie ist die logische Klärung der Gedanken. Die Philosophie ist keine Lehre, sondern eine Tätigkeit. Ein philosophisches Werk besteht wesentlich aus Erläuterungen. Das Resultat der Philosophie sind nicht „philosophische Sätze“, sondern das Klarwerden von Sätzen. Die Philosophie soll die Gedanken, die sonst, gleichsam, trübe und verschwommen sind, klar machen und scharf abgrenzen.
1920s, Tractatus Logico-Philosophicus (1922)
Context: Philosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity. A philosophical work consists essentially of elucidations. Philosophy does not result in 'philosophical propositions', but rather in the clarification of propositions. Without philosophy thoughts are, as it were, cloudy and indistinct: its task is to make them clear and to give them sharp boundaries. (4.112)
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Ludwig Wittgenstein 228
Austrian-British philosopher 1889–1951Related quotes
Source: Philosophy and Real Politics (2008), p. 38.

Source: A New Model of the Universe (1932), p. 33
Context: Philosophy is based on speculation, on logic, on thought, on the synthesis of what we know and on the analysis of what we do not know. Philosophy must include within its confines the whole content of science, religion and art. But where can such a philosophy be found? All that we know in our times by the name of philosophy is not philosophy, but merely "critical literature" or the expression of personal opinions, mainly with the aim of overthrowing and destroying other personal opinions. Or, which is still worse, philosophy is nothing but self-satisfied dialectic surrounding itself with an impenetrable barrier of terminology unintelligible to the uninitiated and solving for itself all the problems of the universe without any possibility of proving these explanations or making them intelligible to ordinary mortals.

“By drawing an object the children will also learn a fundamental doctrine of philosophy”
An Old Man's Thoughts on Many Things, Of Education I
Context: By drawing an object the children will also learn a fundamental doctrine of philosophy; but I don't recommend letting them know what the doctrine is. They will discover it some time. We do not draw objects as they are: we draw them as they seem to be. To the eye things are what they seem to be, but they are in reality, if you know what that means, something else.

As quoted in The Works of the Emperor Julian (1923) by Wilmer Cave France Wright, p. 39; also in The Missing Jesus: Rabbinic Judaism and the New Testament (2003) by Craig Alan Evans, Carl A. Elliott, Bruce Chilton, Jacob Neusner
General sources
Source: The Brain As A Computer (1962), p.42 as cited in: Sica Pettigiani (1996) La comunicazione interumana. p.48

“The Stoics made three divisions of philosophy, Physic, Ethic, and Logic.”
The Philosophy of Antoninus
Context: The Stoics made three divisions of philosophy, Physic, Ethic, and Logic.... It appears, however, that this division was made before Zeno's time and acknowledged by Plato.... Logic is not synonymous with our term Logic in the narrower sense of that word.

Essays on the Higher Education (1899), page 7

The Law of Mind (1892)
Context: In an article published in The Monist for January, 1891, I endeavored to show what ideas ought to form the warp of a system of philosophy, and particularly emphasized that of absolute chance. In the number of April, 1892, I argued further in favor of that way of thinking, which it will be convenient to christen tychism (from τύχη, chance). A serious student of philosophy will be in no haste to accept or reject this doctrine; but he will see in it one of the chief attitudes which speculative thought may take, feeling that it is not for an individual, nor for an age, to pronounce upon a fundamental question of philosophy. That is a task for a whole era to work out. I have begun by showing that tychism must give birth to an evolutionary cosmology, in which all the regularities of nature and of mind are regarded as products of growth, and to a Schelling-fashioned idealism which holds matter to be mere specialized and partially deadened mind.

“Adolf Hitler took Darwin's evolutionary philosophy to its logical conclusions.”
The Origin of Species: 150th Anniversary Edition (2009)