“There is hardly a philosophy which has not invoked something like the will or desire to know, the love of truth, etcetera. But, in truth, very few philosophers—apart, perhaps, from Spinoza and Schopenhauer—have accorded it more than a marginal status; as if there was no need for philosophy to say first of all what the name that it bears actually refers to. As if placing at the head of its discourse the desire to know, which it repeats in its name, was enough to justify its own existence and show—at a stroke—that it is necessary and natural: All men desire to know. Who, then, is not a philosopher, and how could philosophy not be the most necessary thing in the world?”
Source: Lectures on the Will to Know (1970), pp. 4-5
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Michel Foucault 128
French philosopher 1926–1984Related quotes

Die Möglichkeit aller Philosophie ... dass sich die Intelligenz durch Selbstberührung eine Selbstgesezmäßige Bewegung - d.i. eine eigne Form der Tätigkeit gibt.
Schriften, p. 63, as translated in Walter Benjamin: Selected Writings: Volume 1, 1913-1926 (1996), p. 133

The Old Faith and the New (Der alte und der neue Glaube, 1872, translated from the 6th edition by M. Blind, New York: Henry Holt & Co., 1873), vol. II, part IV, ch. 71, pp. 59 https://archive.org/stream/oldfaithnewconfe01stra#page/59/mode/2up-60.

Letter 8; Variant: They would need to be already wise, in order to love wisdom.
On the Aesthetic Education of Man (1794)
Context: They have founded the whole structure of their happiness on these very illusions, which ought to be combated and dissipated by the light of knowledge, and they would think they were paying too dearly for a truth which begins by robbing them of all that has value in their sight. It would be necessary that they should be already sages to love wisdom: a truth that was felt at once by him to whom philosophy owes its name.

Notes Toward a Supreme Fiction (1942), It Must Be Abstract
"Niccolo Machiavelli" (1987)

Ueberhaupt aber bin ich allmälig der Meinung geworden, daß der erwähnte Nutzen der Kathederphilosophie von dem Nachtheil überwogen werde, den die Philosophie als Profession der Philosophie als freier Wahrheitsforschung, oder die Philosophie im Auftrage der Regierung der Philosophie im Auftrage der Natur und der Menschheit bringt.
Sämtliche Werke, Bd. 5, p. 151, E. Payne, trans. (1974) Vol. 1, p. 139
Parerga and Paralipomena (1851), On Philosophy in the Universities

Christian Mysticism (1899), Preface
Context: The phase of thought or feeling which we call Mysticism has its origin in that which is the raw material of all religion, and perhaps of all philosophy and art as well, namely, that dim consciousness of the beyond, which is part of our nature as human beings. Men have given different names to these "obstinate questionings of sense and outward things." We may call them, if we will, a sort of higher instinct, perhaps an anticipation of the evolutionary process; or an extension of the frontier of consciousness; or, in religious language, the voice of God speaking to us. Mysticism arises when we try to bring this higher consciousness into relation with the other contents of our minds.

Source: Kritik der zynischen Vernunft [Critique of Cynical Reason] (1983), p. xxvii