“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.”
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.
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Friedrich Schiller 111
German poet, philosopher, historian, and playwright 1759–1805Related quotes

Source: The Montessori Method (1912), Ch. 1 : A Critical Consideration of the New Pedagogy in its Relation to Modern Science, p. 8.
Context: We give the name scientist to the type of man who has felt experiment to be a means guiding him to search out the deep truth of life, to lift a veil from its fascinating secrets, and who, in this pursuit, has felt arising within him a love for the mysteries of nature, so passionate as to annihilate the thought of himself. The scientist is not the clever manipulator of instruments, he is the worshipper of nature and he bears the external symbols of his passion as does the follower of some religious order. To this body of real scientists belong those who, forgetting, like the Trappists of the Middle Ages, the world about them, live only in the laboratory, careless often in matters of food and dress because they no longer think of themselves; those who, through years of unwearied use of the microscope, become blind; those who in their scientific ardour inoculate themselves with tuberculosis germs; those who handle the excrement of cholera patients in their eagerness to learn the vehicle through which the diseases are transmitted; and those who, knowing that a certain chemical preparation may be an explosive, still persist in testing their theories at the risk of their lives. This is the spirit of the men of science, to whom nature freely reveals her secrets, crowning their labours with the glory of discovery.
There exists, then, the "spirit" of the scientist, a thing far above his mere "mechanical skill," and the scientist is at the height of his achievement when the spirit has triumphed over the mechanism. When he has reached this point, science will receive from him not only new revelations of nature, but philosophic syntheses of pure thought.
Source: Natural Right and History (1953), p. 36

“Any sage can do philosophy, but not every philosopher is a sage.”
Shengren (2011)

Source: quoted in Londhe, S. (2008). A tribute to Hinduism: Thoughts and wisdom spanning continents and time about India and her culture https://books.google.com/books/about/A_Tribute_to_Hinduism.html?id=G3AMAQAAMAAJ

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

"Packard Goose"
"Joe's Garage Acts II & III" (1979)
Variant: Information is not knowledge. Knowledge is not wisdom. Wisdom is not truth. Truth is not beauty. Beauty is not love. Love is not music. Music is the best.

N'en déplaise à ces fous nommés sages de Grèce,
En ce monde il n'est point de parfaite sagesse :
Tous les hommes sont fous, et, malgré tous leurs soins,
Ne diffèrent entre eux que du plus ou du moins.
Satire 4, l. 37
Satires (1716)

Subjectively speaking, the essence of philosophy is certitude; for the moderns, on the contrary, the essence of philosophy is doubt: the philosopher is supposed to reason without any premise (voraussetzungsloses Denken), as if this condition were not itself a preconceived idea; this is the classical contradiction of all relativism. Everything is doubted except for doubt. The solution to the problem of knowledge − if there is a problem − could not possibly be this intellectual suicide that is the promotion of doubt; on the contrary, it lies in having recourse to a source of certitude that transcends the mental mechanism, and this source − the only one there is − is the pure Intellect, or Intelligence as such.
[2005, The Transfiguration of Man, World Wisdom, 3, 978-0-94153219-8]
Miscellaneous, Philosophy