Daniel Schotman

“This so called "synoptic view" of philosophy,
holding as it does that philosophy
is also a science, only one of a more general character than the special sciences, has, it seems to me, led to terrible confusion. On the one hand it has given to the philosopher the character of the scientist. He sits in his library, he consults innumerable books, he works at his desk and studies various opinions of many philosophers as a historian would compare his different sources, or as a scientist would do while engaged in some particular pursuit in any special domain of knowledge; he has all the bearing of a scientist and really believes that he is using in some way the scientific method, only doing so on a more general scale. He regards philosophy as a more distinguished and much nobler science than the others, but not as essentially different from them.”
― Moritz Schlick 'The Future of Philosophy in Richard Rorty (ed.) - The Linguistic Turn

“The object of philosophy is the logical clarification of thoughts. Philosophy is not a theory but an activity. The result of philosophy is not a number of 'philosophical propositions', but to make propositions clear.”
― Ludwig Wittgenstein, Tractatus Logico Philosophicus

“Πρωταγόρας : 'πάντων χρημάτων μέτρον ἐστὶν ἄνθρωπος, τῶν μὲν ὄντων ὡς ἔστιν, τῶν δὲ οὐκ ὄντων ὡς οὐκ ἔστιν.”
― Plato, Protagoras

“Several years have now passed since I fi rst realized how numerous were the false opinions that in my youth I had taken to be true, and thus how doubtful were all those that I had subsequently built upon them. And thus I realized that
once in my life I had to raze everything to the ground and begin again from the
original foundations, if I wanted to establish anything firm and lasting in the sciences.”
― René Descartes, Meditations on First Philosophy