“What is philosophy? This is a notoriously difficult question. One of the easiest ways of answering it is to say that philosophy is what philosophers do, and then point to the writings of Plato, Aristotle, Descartes, Hume, Kant, Russell, Wittgenstein, Sartre, and other famous philosophers. However, this answer is unlikely to be of much use to you if you are just beginning the subject, as you probably won’t have read anything by these writers.”

Philosophy : the basics (Fifth Edition, 2013), Introduction

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Nigel Warburton7

British author and lecturer 1962

Josef Pieper (1904–1997) German philosopher

Source: Leisure, the Basis of Culture (1948), The Philosophical Act, p. 63

“Daly: In a sense, would you say that the age of biogenetics/cyberspace is the age of philosophy?
Žižek: Yes, and the age of philosophy in the sense again that we are confronted more and more often with philosophical problems at an everyday level. It is not that you withdraw from daily life into a world of philosophical contemplation. On the contrary, you cannot find your way around daily life itself without answering certain philosophical questions. It is a unique time when everyone is, in a way, forced to be some kind of philosopher.”

Slavoj Žižek (1949) Slovene philosopher

Conversations with Žižek by Slavoj Žižek and Glyn Daly (Cambridge: Polity Press, 2004), p. 54

“Isaac Newton deserves to be included in a series of companions to major philosophers even though he was not a philosopher in the sense in which Descartes, Locke, and Kant were philosophers. That is, Newton made no direct contributions to epistemology or metaphysics that would warrant his inclusion in the standard list of major philosophers of the seventeenth and eighteenth centuries – Descartes, Spinoza, Locke, Leibniz, Berkeley, Hume, and Kant – or even in a list of other significant philosophers of the era – Bacon, Hobbes, Arnauld, Malebranche, Wolff, and Reid. The contributions to knowledge that made Newton a dominant figure of the last millennium were to science, not to philosophy.”

I. Bernard Cohen (1914–2003) American historian of science

Source: The Cambridge Companion to Newton, 2002, p. 1

“Now this structure of hope (among other things) is also what distinguishes philosophy from the special sciences. There is a relationship with the object that is different in principle in the two cases. The question of the special sciences is in principle ultimately answerable, or, at least, it is not un-answerable. It can be said, in a final way (or some day, one will be able to say in a final way) what is the cause, say, of this particular infectious disease. It is in principle possible that one day someone will say, "It is now scientifically proven that such and such is the case, and no otherwise." But […] a philosophical question can never be finally, conclusively answered. […] The object of philosophy is given to the philosopher on the basis of a hope. This is where Dilthey's words make sense: "The demands on the philosophizing person cannot be satisfied. A physicist is an agreeable entity, useful for himself and others; a philosopher, like the saint, only exists as an ideal." It is in the nature of the special sciences to emerge from a state of wonder to the extent that they reach "results." But the philosopher does not emerge from wonder.
Here is at once the limit and the measure of science, as well as the great value, and great doubtfulness, of philosophy. Certainly, in itself it is a "greater" thing to dwell "under the stars."”

Josef Pieper (1904–1997) German philosopher

But man is not made to live "out there" permanently! Certainly, it is a more valuable question, as such, to ask about the whole world and the ultimate nature of things. But the answer is not as easily forthcoming as for the special sciences!
The Dilthey quote is from Briefwechsel zwischen Wilhelm Dilthey und dem Grafen Paul Yorck v. Wartenberg, 1877–1897 (Hall/Salle, 1923), p. 39.
Source: Leisure, the Basis of Culture (1948), The Philosophical Act, pp. 109–111

“There is but one truly serious philosophical problem and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy.”

Albert Camus book The Myth of Sisyphus

The Myth of Sisyphus and other essays by Albert Camus, An Absurd Reasoning : Absurdity and Suicide p. 3 (1942, 1955)
Absurdity and Suicide
The Myth of Sisyphus (1942), An Absurd Reasoning
Context: There is but one truly serious philosophical problem and that is suicide. Judging whether life is or is not worth living amounts to answering the fundamental question of philosophy. All the rest – whether or not the world has three dimensions, whether the mind has nine or twelve categories – comes afterwards. These are games; one must first answer. And if it is true, as Nietzsche claims, that a philosopher, to deserve our respect, must preach by example, you can appreciate the importance of that reply, for it will precede the definitive act. These are facts the heart can feel; yet they call for careful study before they become clear to the intellect. If I ask myself how to judge that this question is more urgent than that, I reply that one judges by the actions it entails. I have never seen anyone die for the ontological argument.